It appears the website was defaced Friday, 4:00 am and first reported by Abs Cbn news.
“HACKED by Dbuzz… Creditz To: Black Angels || Brian Kamikaze | Pak RT |,” the hackers greeted in the defaced page.
At least 3 sub domains(support.philpost.gov.ph, e-postmo.philpost.gov.ph, profilepo.philpost.gov.ph) are being hacked by the hacker and its home page (www.phlpost.gov.ph).
In the time of writing, the landing page of the website is still under maintenance.