@meltech: Read this about Sweat Captcha and their deliberate malware.
https://blog.sucuri.net/2015/06/sweetcaptcha-service-used-to-distribute-adware.html
Then uninstall and remove it from any WP site you have or are responsible for. Despite the deceptive post from member “Sweet Captcha” above, the plugin authors know full well about this infection and deliberately put it in place for their own financial gain (and at the financial loss of those using it).
