WP Hacked – How to find all malicious code?

Hello all,

Looks as though our website has been hacked and some spammy links are appearing on certain pages.

I used the Sucuri plugin to located some of the code within the theme header php file and cleared it off the home page but it’s as if there’s hidden pages within the website and links in the header.

I am unsure of what to do next to completely remove this from the site.

As a precaution we have updated to more secure passwords.

Many thanks for your help!

The page I need help with: [log in to see the link]