If I were to hack a WP site, I would insert js in the header with an exploit, most likely in a template file. Check one of these from your header:
teen-porn-tube.com/wp-content/themes/WPTube3/js/jquery-1.3.2.min.js
teen-porn-tube.com/wp-content/themes/WPTube3/js/jqueryslidemenu/jqueryslidemenu.js
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