Malicious PDF — malware analysis report

Static analysis result for SHA-256 7314c8d74e72c689…

MALICIOUS

PDF

86.3 KB Created: 2021-06-29 21:08:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 71750593839f4729396d438a09d527ea SHA-1: c8dfb0abad120134b05c1a5dd500f323f59f68f2 SHA-256: 7314c8d74e72c68999de9b8c890cc3680cb4a80e87b82348934b48882a2c33dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The presence of these compromised CMS upload links suggests an attempt to disguise malicious content within seemingly legitimate infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • 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
  • 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://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/9fb46fc389372b7a1fbd233977e4e2a4/zasowezilo.pdf In PDF document text
    • http://doktor-okonski.pl/uploadimg/file/94577853117.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/kifimen.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/d12a1775643b1c2dbeb23c15ae04f9e4/95050257597.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2dff0badc---jipapibuxu.pdfIn PDF document text
    • http://thietbixanh.net/uploads/files/14081600792.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160caa67611ec1---72091748751.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/gefebarojumafaso.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160c5685a7cae0---kopopil.pdfIn PDF document text
    • http://cortabellanews.com/userimages/bujegi.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/84276555108.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/dazibepakavodaxog.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/85121841847.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/kafunoluwenitodikosivifa.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/e50e37231575b86f45cb295c24c406ea/fugavegoxigavataw.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b144f3fbc---67059209297.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/710f5a97d336ebb4fe675e87c584ccbc/56874604409.pdfIn PDF document text
    • http://www.nomorcantikspesial.com/file/wosuvagar.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/45828975d3555b2dcce44804638ba175/85169441237.pdfIn PDF document text
    • http://johnsonsdynastyincfamilyassociation.com/clients/10108/File/jigibubokesexuk.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/7a3178c955b02b7fce0de57ecbdcc17c/50026240131.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/943466e59808da92ba439bbffb653f72/86367268762.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/22675885137.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=the+haunting+of+hill+house+rottenPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA7 17244 bytes
SHA-256: 8cde00b11f2feacf9e90a25806262d34f36c5667e509d7169ae699c5fbc0738f
font_01_sfnt_off00011bd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133EF 10556 bytes
SHA-256: 7d0cd075001cbaf805361b53dcec6173bd2424dfe2bf71961b02066e6150837a