http://www.icyphoenix.com/viewtopic.php?f=4&t=1516
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Zuker
Thu 05 Apr, 2007 15:48

SECURITY - How To Block Some Addresses In Referrers Page
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OPEN 

[b]includes/functions_referrers.php[/b]

FIND

[code linenumbers=false]$ref_black_list = array(
	'.wst.st',
	'.neyon.com',
	'.byethost',
	'cialis.w48.54.ru',
	'.volja.net',
	'.siol.net',
	'.alice.it',
	'xoomer.alice.it',
	'.skynet.be',
	'users.skynet.be',
);[/code]


Add the domain you wish to block... and check if it works. 

ex: 

[code linenumbers=false]	'.1awm.com',[/code]

P.S.: another suggestion is to set Referrers Permissions to REGISTERED users or above in ACP => Configuration => Page Permissions.