Malicious PDF — malware analysis report

Static analysis result for SHA-256 6257b6415e422caf…

MALICIOUS

PDF

62.5 KB Created: 2021-05-23 18:44:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 156f12cef7fc40cec8475a057342730c SHA-1: e69bf3444595a05159e640b89542d15056f27bd7 SHA-256: 6257b6415e422caf696866cede6b10b3bf36ebe4722527ff9bea0226f3da0fb4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links pointing to compromised WordPress upload directories, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to exploit users by directing them to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4985c5351---53399314809.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f365e54d3c---bibevezifaxa.pdf
    • http://stolizstekla.ru/userfiles/file/segulamokewo.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a34f919f93---98613730774.pdf
    • http://alibabashipping.com/userfiles/file/zaxamuxeraxavumoku.pdf
    • http://am-assets.com/aom/magnolia/userfiles/file/zuvemagi.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/c4b142561c3d01cd39e1d9a8143766b0/xifakamuxivavelo.pdf
    • https://stillwaiting.org/userfiles/file/66583143077.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609834ee85e6b---digav.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094207a83322---jiporejotafu.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/8f7b9105304357d349f25821f4f67efe/4430137259.pdf
    • http://domeinbeverdonk.be/assets/files/file/18370873690.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074974bbe9c0---sageduwilugolex.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/96af996c5345ec7720d4ad1c86fb1d9d/masolomovejofikufotaloja.pdf
    • http://aldo-ins.com/userfiles/file/61387005233.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=la+casa+de+papel+guitar+tab+pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9f9.bin
f9c514d8c4e55cf2a846794095d646b938b7059f028614f76539811edcf76f47		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F9 5404 bytes
font_01_sfnt_off0000dc68.bin
35c6d55a240a45755ae0f0ae4e4ee10be479079f05b09c7218f8c4e519c1a5b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC68 10500 bytes

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