Malicious PDF — malware analysis report

Static analysis result for SHA-256 fffcea7520397002…

MALICIOUS

PDF

80.1 KB Created: 2021-06-22 13:29:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2cc59e32c505ba06e3327bb65df9ae61 SHA-1: fc25709af00c9f97afd2601dccea17f9e138c3f0 SHA-256: fffcea7520397002aac824f33a9d18249eab2d013c2c542d570da329d139968f
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites. The embedded URLs and the nature of the heuristics suggest an attempt to lure users to malicious or phishing content, likely as part of a phishing campaign.

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://cructi.ru/uplcv?utm_term=how+to+mod+apps+using+apk+editor
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a020e5eea55---selobuvelosuk.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/9c9ea16102a348dfcfff6269a75d0ed7/bifoxevik.pdf
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4defe4a47---16743145298.pdf
    • https://celebicatering.com/upload/ckfinder/files/sabetevoku.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd337a9ce2---nadugira.pdf
    • http://koreaseals.com/ckfinder/userfiles/files/90546772350.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/618155818fcaa2bc5a185b9ca514a475/61111287080.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a7233f44123---nojotefodukawudedupesu.pdf
    • http://stolizstekla.ru/userfiles/file/sifoluzo.pdf
    • http://tanriovermensucat.com/uploads/genel/files/migubopud.pdf
    • http://trungnguyenjsc.vn/uploads/image/files/fubowiwilomemat.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/4lqjc3r8tjn8vcnakr494inm13/vezoritifupodasa.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160beb20b71941---dotowewetowarilekomedepa.pdf
    • https://zegabilisim.com/calisma2/files/uploads/fikitibemilubolapokowa.pdf
    • http://hanarotalk.com/userfiles/file/%5C/ruwegiladodiremezumuxotog.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_off0000f925.bin
00ee4f02a51db11dc58b9ff1996d82f570ab69760d94d6756d46f696016d77cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF925 5364 bytes
font_01_sfnt_off00010b5b.bin
1426793d329f121bcb304fe5597f8227e37d8c7fce07a763c9c78e92d5a68c0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5B 12024 bytes

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