Malicious PDF — malware analysis report

Static analysis result for SHA-256 5afd393b0bc70f53…

MALICIOUS

PDF

73.0 KB Created: 2021-06-10 09:18:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 60d4f9d5e6e47a52f20307eb3bb0d03c SHA-1: bdf672bee304e18896f9295737498cff9a3b1b8b SHA-256: 5afd393b0bc70f53c0928198e219426d201586d268ad236a4750dddbd9cfb398
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://philabc.ru/uplcv?utm_term=psicologia+educativa+anita+woolfolk+12+edicion
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f70967bea---pojatu.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073864cb10fc---rovexusubivamoseso.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/9f99c154349c9cd5ce6e196d297ab8e2/kowetavikebun.pdf
    • https://kovtec.pl/eurostyl/photos/file/26334234281.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/05211a3aafe314e4d55265f6fc79071e/62761712464.pdf
    • http://bigandtallking.com/userfiles/file/82569318150.pdf
    • http://www.allatpatikapecs.hu/images/file/65520345033.pdf
    • https://ises.ca/phpsites/vertical_living/uploads/file/zivadusugebake.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/5e71d578306c858ef412478d36187fe3/46947208438.pdf
    • http://files.ibiza-ferien.de/file/gotamanufipi.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b050f25783e---64614643536.pdf
    • http://jar-ted.pl/file/pezuwedonubazagebu.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081583c96d35---disuwoximixosabuweside.pdf
    • https://pet-fashion.ro/mm/file/xiwug.pdf
    • https://ooo-kenk.ru/userfiles/file/63851663835.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_off0000d8f0.bin
03b1d4be6d8dd70ca4c78fa72ffd48b2a36ed3efa63246ff589c36c137fad3ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F0 5496 bytes
font_01_sfnt_off0000ebd8.bin
6c56199f2732249cc162310241e338940bbc54f8ff5a09bd98f4f0045b3da1b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD8 12804 bytes

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