It’s common knowledge that attackers often use email as a delivery mechanism for their malicious activity — which can range from enticing victims to click a phishing URL or download a malicious attachment.
To support these activities, attackers seek out tools that assist in the mass sending of malspam (malicious spam) emails from a compromised website. PHP scripts like Leaf PHPMailer are well suited for this task.
Hacktool Analysis: Leaf PHPMailer
Leaf PHPMailer is a PHP mailer hacktool that lets an attacker send out large amounts of malspam emails from a compromised website’s web server.