[support] spam?

[Tony Crockford]

I regularly get these:

zlmafgbcfa sent a message using the contact form at http://www.workalone.co.uk/contact 
.

UPg7R6  <a href="http://uhduypepbxzs.com/">uhduypepbxzs</a>, [url=http://vqzynqgrgnym.com/ 
]vqzynqgrgnym[/url], [link=http://xnxxterbeogm.com/]xnxxterbeogm[/ 
link], http://jopblpdvuamw.com/

obviously the random letters change.

is it a spam bot?

or something broken?

TIA for your thoughts