Some script is injecting an ad into my site and I can't find it.

The website in question is http://www.leotheshittygamer.com It was just purchased today by my friend, and I slapped wordpress and a theme on it, and logged out to find this ad hidden under the wordpress toolbar.

I'm sure it's a script because it's not in any of the php files that came with the wordpress theme. It appears after the closing head tag and before the body tag. I inspected it with chrome to find this.

</head><a href="http://descargarmusicax.com/" style="dislay:none;">Descargar musica</a><body>

As you might notice, the link displays because "dislay" is not a real property. I searched all the scripts that chrome says are being used to build the page, and "dislay", which seems like an obvious term to search for, comes back with nothing except the link itself.

I also searched for "body" and "head" figuring it's likely inserted before or after those tags respectively, and as far as I can tell, everything looks on the up and up.

How can I find what is causing this to display and kill it?