Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b3a979d25618ce6…

MALICIOUS

PDF

72.1 KB Created: 2021-05-23 04:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3cc39ccf63fd075673ca076ebd110953 SHA-1: e6e94de5f9604a9758309d844683654a3561855c SHA-256: 6b3a979d25618ce67eca41b07c78b5e7bfd4896da92be4b75855a32529cc55a5
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier 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, suggesting an attempt to lure users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9610

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://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/hkru6so30p44ac6eb8qshoora5/pufudigezepolilu.pdf
    • http://ahchala.com/img/file/kitam.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/8idfb8e3otrge3pk7li0n2tbg3/jirinuf.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/p3kohep2ff99f312rt2vejc67s/ninuvesivavulofival.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/osor3eqnbrbr3io0lfmunh32p2/saviwefuwodidimupapate.pdf
    • http://bioident.pl/photos_fck/file/tojaloborol.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/sapc2bjhrkehpuaa32crlo74fd/38732061880.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160991d2583f81---navurawejipet.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160775c6c79569---91994764184.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f1cd4fffa---37304801055.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/6aa476a183cae3a9d8d0c1f5df321111/6928158242.pdf
    • http://jarosi.hu/files/file/54556787986.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a48f614800d---lenotipekajupufebapixo.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758a9fe00cc---rareris.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607873f5c50d2---97077293962.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=langston+hughes+facts
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e714.bin
af58284e477cfe8347c5d5a95ddbe2b3d0de6a6218289251d5566002c42c432f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE714 4956 bytes
font_01_sfnt_off0000f7ff.bin
106b79fc6e714a6fbfd0a827319cb38066531721eabceba92ebf373e86fffe1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FF 10676 bytes

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