Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a244ef212300c45…

MALICIOUS

PDF

86.2 KB Created: 2021-09-04 01:34:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 04bbf2d72257d30b0e56db36931a1858 SHA-1: 45f95cdb3a5dbd31c7cb0a6311b07129c11a7ce4 SHA-256: 8a244ef212300c45d441988f19fbee6c216e3fb408a3796a6c372701b4e94e7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were directly extracted, the nature of the links and the heuristic firings indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://demirlermetal.com/resimler/files/37672482900.pdf In PDF document text
    • http://email-database.info/userfiles/file/guxasedowujetulitijitavil.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/44807914325.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c91623164e8---62809712910.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3da49af118---21548162340.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210605103104.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/vujutagijidebiximuni.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/puwipivujoxosesu.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/35bbd6d177c435623264c9a029c39fab/20321962905.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/31927751646.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/soluzadududav.pdfIn PDF document text
    • http://hongdacable.com/d/files/13112725551.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/sasemenokekuxokuxavej.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/tekisatorulijaludu.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/pujago.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/14858055832.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/25022610263.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/786ddi95j2ltjs3bn08q1015p5/lobosaserazutosafog.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160dfda2a93e1f---darubu.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1fc11831c0f20925ef2036c79f40419c/7809405884.pdfIn PDF document text
    • http://rc-modeller.se/images/file///57855771031.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/vbnt25mm6aif813op092d8e1tc/43612759193.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ac221e736---99103830749.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/s73h1mcmf4ea8u11psps1afq74/vexirizu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=spelling+practice+book+grade+3+pdfPDF 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_off0000ea34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA34 11104 bytes
SHA-256: ce69c48c58e92d028129ff06d9f7773daaae829aa619c16a01951b9a9ad4507f
font_01_sfnt_off000103d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011be9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE9 18340 bytes
SHA-256: cbde03e8f50d044fbaa6da693be248f1a6ee0892d7174fd9318066f02bce4677

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