Hmm. If you alter the search to "filename:wp-config.php FTP_PASS" you start getting some that look like ... legit. For those who don't know, WordPress has some level of access to hosting server via FTP, for upgrades and plugin installs.
Pertinent config globals are FTP_BASE, FTP_CONTENT_DIR, FTP_PLUGIN_DIR, FTP_PUBKEY, FTP_PRIKEY, and of course, FTP_USER, FTP_PASS, FTP_HOST.