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By Jeevan Tipke
Published:
Updated Date:
7 min read
The Japanese keyword hack is an SEO spam infection that fills your site with thousands of auto-generated Japanese pages selling counterfeit goods. They appear in Google under your own domain, drag down your reputation and rankings, and often come back if the root cause isn’t fixed. This guide explains how to confirm the infection, clean it, get the spam out of Google and stop it returning. Reviewed October 2026.
The short answer: back up, scan and clean files and the database, remove the entry point (outdated plugin, stolen password), return 404 or 410 for the spam URLs, submit a clean sitemap, use Search Console’s removal and review tools, and then harden the site. Recovery in Google commonly takes weeks. If you’d rather hand it over, The Adroit’s WordPress team can help. Prevention checklist: WordPress security tips.
Attackers who gain access (usually through a vulnerable plugin or theme, or stolen credentials) inject code that generates spam pages with Japanese product keywords, often luxury brands, sportswear and electronics. The pages can use odd URLs such as /983/cheap-brand.html or /?q=…, may only show to Googlebot (cloaking), and can redirect visitors to scam shops. It is most common on WordPress but can hit any CMS. Google may flag the site as hacked and, in serious cases, apply a manual action for hacked content or spam.
| Sign | Where to look | What it means |
|---|---|---|
| Japanese titles or unknown pages | Google search: site:yourdomain.com |
Spam URLs are indexed |
| Sudden jump in indexed or “not indexed” pages | Search Console > Pages | Thousands of injected URLs |
| Hacked content or manual action warning | Search Console > Security issues and Manual actions | Google has detected the compromise |
| Unknown files or folders (numeric folders, odd PHP files) | File manager or SFTP | Injected malware or doorway pages |
| Changed .htaccess, index.php or new admin users | Files and Users screen | Persistence for the attacker |
| Spam only visible to Googlebot | Search Console URL Inspection (live test) | Cloaking, so your own browser may look normal |
Also scan with a reputable tool such as Sucuri SiteCheck or your host’s scanner. Note that external scanners can miss cloaked or server-side malware, so check files and Search Console too.
Change passwords for WordPress admins, hosting/cPanel, SFTP/SSH, the database and email. Rotate the security keys in wp-config.php (this logs everyone out), delete unknown admin users and enable two-factor authentication.
/wp-content/uploads/ (it should contain media, not PHP files), .htaccess, index.php, wp-config.php and unfamiliar numeric folders in the web root.If this feels risky, use a malware-removal service or your host’s cleanup. Cleaning is only complete when the entry point is also closed.
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Update WordPress core, every plugin and theme, and PHP. Delete anything unused or abandoned, and any “nulled” premium plugins. Review which plugin or account was the likely way in, since the infection will return otherwise. See our WordPress security checklist.
Once the files are gone, spam URLs should return a 404 (not found) or 410 (gone) status so Google drops them. Do not block them in robots.txt: if Google can’t crawl a URL it can’t see that it’s gone, and the URL may stay indexed longer. Avoid broad robots.txt rules such as blocking all .html files or /index.php, which can harm legitimate pages. Use robots.txt only for normal crawl management.
Search Console only displays a limited number of URLs per report, so export the lists in batches, add newly found spam URLs and repeat until the counts fall.
The cleanup itself can take hours to days. Google’s recovery depends on how many spam URLs were indexed and how quickly they’re recrawled, and commonly runs from a few weeks to a couple of months for large infections. Rankings often return gradually once spam is gone and any manual action is lifted.
The Japanese keyword hack is fixable: clean thoroughly, close the entry point, make spam URLs return 404/410, use Search Console to speed recovery and keep monitoring. If you want experienced help, talk to The Adroit’s WordPress team, and see our wider SEO services for post-recovery visibility.
An SEO spam attack that injects thousands of Japanese-language pages, usually promoting counterfeit goods, into your site so they get indexed under your domain.
Search site:yourdomain.com in Google for unknown Japanese pages, check Search Console for security issues and indexing spikes, and look for unknown files or admin users.
Many infections cloak content so only Googlebot sees it. Use Search Console’s URL Inspection live test to view what Google sees.
No. Let them return 404 or 410 so Google can recrawl and drop them. Blocking prevents Google from seeing that they’re gone.
No. It hides URLs temporarily (about six months). The lasting fix is removing the pages and returning 404/410.
Often a few weeks to a couple of months for large infections, depending on how many URLs were indexed and how fast they are recrawled.
It can if a backdoor remains or the original vulnerability or stolen credential isn’t fixed. Update everything, rotate passwords and keys, and monitor.
A reputable plugin or firewall helps detect and block attacks, but it must be combined with updates, strong logins and backups.
Clean the site fully, then request a review in Search Console describing what you fixed. Don’t request one before cleanup is complete.
Yes. The Adroit’s WordPress team handles malware cleanup, spam URL removal and hardening.
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CEO at The Adroit
Bachelor of Engineering (B.E.), MBA | Certified Digital Marketing Professional (Semrush, Hubspot, Linkedin, Amazon & Skillup)
Jeevan is an accomplished marketing professional with an extensive blend of academic qualifications and industry experience. He holds a Master’s degree from ITM Business School and Southern New Hampshire University (SNHU), UK, and brings with him an impressive 23-year career spanning both Traditional and Digital Marketing.
Over the years, Jeevan has built deep expertise in modern marketing practices. He is a certified Email Marketing and Social Media Marketing specialist from HubSpot and has further strengthened his knowledge with certifications in Entrepreneurship from HarvardX and as a Sponsored Products Ninja from Amazon.
Currently serving as the CEO of The Adroit, Jeevan plays a key role in driving the company’s growth, innovation, and client success in the digital marketing space.
Beyond his professional work, Jeevan is also a passionate blogger. He runs the blog Blogshog where he regularly writes about Digital Marketing, Health & Lifestyle, and a variety of insightful topics aimed at educating and empowering readers.
Outside of work, Jeevan enjoys staying active and spending his leisure time playing sports such as Badminton and Table Tennis. His diverse interests, entrepreneurial mindset, and commitment to continuous learning highlight his dynamic presence in the marketing industry.
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