Malicious PDF — malware analysis report

Static analysis result for SHA-256 3afdefa029452777…

MALICIOUS

PDF

74.7 KB Created: 2021-06-13 18:42:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd7e5eb27fae058bfe9054361530c608 SHA-1: dc8b711e6c5b237c5b2c1c0ba70f90639431a687 SHA-256: 3afdefa029452777e7babee369a766893b2557cc5928121a56098c833b291c4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute phishing content or malware. The presence of embedded JavaScript, though not directly executable in this PDF context, indicates a potential for malicious scripting if the PDF were to be processed in a different environment or if it's part of a larger attack chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://cructi.ru/uplcv?utm_term=biology+lab+report+seed+germination
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776ef181502---sisidibegatosos.pdf
    • http://bualuang101.com/backoffice/upload/files/kofazekugafipodabaza.pdf
    • http://originalcheck.it/public/img_admin/file/%5C/47634403714.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a09e01aa3d---30941725411.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16087b837cbaa7---58921780213.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/a354e6fc9b18dcaf9dfa09a0dbb03817/5058133847.pdf
    • http://artecgroupservices.com/imagenes/file/31535383587.pdf
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/cdecaa53811a04ab0b377a054920f0fa/33456858305.pdf
    • http://drthchowdary.net/userfiles/file/jalamofotudebitur.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a496da68ae---tafemovidogotusuwel.pdf
    • http://okuninka-biale.pl/userfiles/file/sulegokopurokuwo.pdf
    • http://zulassungsservice4you.de/bilder/file/14528174698.pdf
    • https://radmangroup-ye.com/rgfiles/file/zudizejosazovum.pdf
    • http://2ds-creations.fr/userfiles/file/woxeguxoxowelote.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2d3a268af---xemekugasiwomafusosuwozo.pdf
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/rqvs4q23lc640d33ufju2b6hlo/sodonuduvimafumabululev.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b32fe48824d---11949033196.pdf
    • https://securitegenerale.tn/userfiles/file/kegubumu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e545.bin
e711e1f226b79602fbda7fc9d1fbb8fb06fe1f81ab3f76489d6a6bff2bf9ab2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE545 5572 bytes
font_01_sfnt_off0000f820.bin
ab22bd9ed5630825a94e48c138e3fc318e8596febf9295cf24cc8ad3e28d130b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF820 11008 bytes

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