WP Site遭到攻击,Page Keep在网站访问时回来

I really need help. One of my wordpress site got hacked and i can't find the hacked files. The page keep coming back by reinserting the post. Lets say i manually delete the post from the db, the post will reinsert as another ID when the site is visited.

And also if i have already login as admin, the page would hide itself.

The page address http://urbanyoga.com.sg/3gp-sexy-videos/

Any advice would be appreciated. I have installed both sucuri and wordfence but nothing detected.

In the top of your theme files there is a code strip before the real code starts. It creates the redirect. Remove it manually by editing the .php-files and the .htacess. Otherwise you can try a plugin called "Wordfence Security"