Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cf8f464fb46a212…

MALICIOUS

PDF

82.1 KB Created: 2021-09-07 02:01:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1f975e1296d6648327ec65da3db6ed64 SHA-1: 1918c63ec41b68f436f5448c18ef83d10ea4ff14 SHA-256: 9cf8f464fb46a212fee7678c3e8fe6fd92dfff4fcd7775167ea31a1888db1030
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or are structured as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or SEO abuse. No scripts were extracted, but the structure suggests it's designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://wastran.ru/uplcv?utm_term=chemical+bonding+jee+advanced+notes+pdf PDF link annotation
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/gikozeredipofipiki.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d05eaca6f0---45633936066.pdfIn PDF document text
    • https://xn--faade-mtal-p6a3a.ch/ckfinder/userfiles/files/rikazavegewenevu.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f333c85c8d3---49746658665.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/1nkd5l7c46qcdklpk0ac3e8dii/18560950909.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/0e64a203566886568b1ddcc26848f3e2/8470158563.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/698bd45e91a0d15a81c483f80e50dc52/talogebafovubitivawoben.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/4b85cd8f18f91a5f5730a034f56a4c92/33559636674.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/c9100b5832a36a2f308c3e6b4ea38b3b/solibivakosigejej.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/gilusipa.pdfIn PDF document text
    • http://schokozentrale.de/idata/7170873706.pdfIn PDF document text
    • http://henri-ruch.ch/doc_pub/file/wazunaben.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1e6abcnb1obn1pfevtu0je0mt6/felezeditudo.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/36aea469e9aedf1e3cbf8c687b3681d6/33093831486.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/27751494359.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16090c739a5e4f---diworono.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/tofufuzajaxu.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/l7rhpdvkqr4c80ebtljor057p7/73292216496.pdfIn PDF document text
    • https://jobtiara.com/files/files/95539787920.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/mimeletuwunatojomala.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/madufawitiforavix.pdfIn PDF document text
    • http://dalaichau.com/files/valej.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbf9db8723---59397705955.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/4b13b549b16def4a618e0977dfe71dd6/59454068899.pdfIn PDF document text
    • 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_off0000da4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4D 11332 bytes
SHA-256: 89bd9248bada408822c30f207896dd4b9a2ac20bc0628b7bd016292c1568810c
font_01_sfnt_off0000f45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45C 17676 bytes
SHA-256: a9f3b244fefe2effb6feae4fa03fd6f9ef63410f6529fa419fc51883a7e34822
font_02_sfnt_off0001220d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1220D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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