HELP!!! very strange…

what u have to hack site?

Write to your provider, and update WP after your site has been restored.

Sigh, defacing a site like that, that’s really rude.

Restoring a backup won’t necessarily fix it for you.

You need to start working your way through these resources:
https://codex.www.ads-software.com/FAQ_My_site_was_hacked
https://www.ads-software.com/support/topic/268083#post-1065779
https://smackdown.blogsblogsblogs.com/2008/06/24/how-to-completely-clean-your-hacked-wordpress-installation/
https://ottopress.com/2009/hacked-wordpress-backdoors/

Additional Resources:
https://sitecheck.sucuri.net/scanner/
https://www.unmaskparasites.com/
https://blog.sucuri.net/2012/03/wordpress-understanding-its-true-vulnerability.html
https://codex.www.ads-software.com/Hardening_WordPress
https://www.studiopress.com/tips/wordpress-site-security.htm

Unfortunately when hackers are trying to get into a specific hacking team, they don’t care what they deface. The more they can deface to show their skills, the more chance they can get into a team or to get some sort of respect from other hackers. That’s usually why they deface a site.