Blackhat SEO, or spam-seo, is a malicious technique used to manipulate the search engine results in order to benefit a website in terms of relevance. The payload is based on .htaccess rules, thus intended for server-side use and the payload is executed directly on the server, before the site is rendered. Only the payload result (spam content, redirect) is visible in the browser, not the malicious code itself.
Malicious crafted .htaccess rules which causes redirection of the visitor to other websites with spam or malicious content. Redirections are often conditional, being triggered based on user-agent, referrers and IP addresses.




This malicious code affects any vulnerable or compromised website that is configured to interpret the script language.


Inspect your site's files, specially theme related, to find for code you don't recognize. Look for any encoded or obfuscated PHP code. Also, .htaccess files are a common target for SPAM SEO.
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RewriteCond %{HTTP_USER_AGENT} (google|yahoo|msn|aol|bing) [OR]
RewriteCond %{HTTP_REFERER} (google|yahoo|msn|aol|bing)
RewriteRule ^([^/]*)/$ incongruous-lentil.php?$1 [L]