This blog is running on WordPress Turnkey Linux http://www.turnkeylinux.org/wordpress
and I wanted to get rid of their default footer with Turnkey credits.
I used Putty to log in with my root account and ran following commands in shell:
mv /etc/apache2/mods-enabled/substitute.conf /etc/apache2/mods-enabled/substitute.old
Footer is now gone 🙂