Malicious PDF — malware analysis report

Static analysis result for SHA-256 46a3a5ddd3ccca94…

MALICIOUS

PDF

87.0 KB Created: 2021-09-02 07:45:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8098c9d3f4530abd64ffc71e3ab0e330 SHA-1: 986dc892f052427b7caf1565b07dd2266e2a39fc SHA-256: 46a3a5ddd3ccca9459925c0404852ae81984fd51e7698e3d6b38c14aa99e675c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a vehicle for the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://jmdfhjl.com/fckeditor/userimages/file/rumepodixejifin.pdf In PDF document text
    • https://fizjolech.pl/userfiles/file/noxozulamukima.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160809ee3815c8---wiwivekekoporodotimej.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/7be6b9174e6b1d052e9e009c5d6488eb/rapuvejusakelasarikejit.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8cd059d5d---piwilisita.pdfIn PDF document text
    • https://jdlpartnerss.com/userfiles/file/masupepabamiwuwuxev.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/roromemabesigivetigupera.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/47705414273.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/a400810aukg93k6nfobmb0257p/tipib.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/wavigevubafusowibir.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/60731562007.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/qa7qgcn7m8gb50ik4lsol8nrv5/bigevejebo.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/9c4d7b2c3bf2aff4e56245d295f65eb7/84803598661.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/54683340048.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/guvijedenetatikutunomez.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/56650839118.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/51062252254.pdfIn PDF document text
    • http://marymo.ru/uploads/files/zexeterutozetagipeneno.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/43197280468.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/nuwadinuxolawidajas.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/pepez.pdfIn PDF document text
    • http://liddellgaryfamily.com/clients/863293/File/11785169819.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=cheapest+medical+schools+in+illinoisPDF 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_off0000ed7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10596 10712 bytes
SHA-256: 9d78288f0d85d591ead34464e1c585365a098c698c8bc5691629391270f97c06
font_02_sfnt_off00011dff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFF 18508 bytes
SHA-256: 442b0e586ea4a0b371dbbbc65f4401e4b78f4414ce304b0433da4c518d264a8d

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