The bulk were financial institutions but ISPs made up over 10 per cent of targets for the first time, and phishing attacks against retail companies rose sharply during the month.
The research also revealed that phishers are getting smarter in their attempts to fool the public.
"Another notable trend is the decrease in the 'just an IP address domain' percentage. It has been falling for the past three months, and the strongest decrease was in April at 11 per cent," said an APWG spokesman.
"This trend shows the growing skill of phishers in disguising their scam attempts. A lot of recent phishing sites use 'hijacked' servers where the scam is located on the domain of a legitimate enterprise to which the phisher has gained remote access.
"This gives the scammers the advantage of having a link that leads to a legitimate domain that cannot be blacklisted."
The US still hosts more phishing sites than any other country at 26.3 per cent, but China is catching up fast at 22 per cent. The APWG report suggests that the increasing availability of broadband is driving phishing in China.
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