Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c41d651c04593f6…

MALICIOUS

PDF

69.9 KB Created: 2021-09-24 11:51:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 01727eb595ecab2c4f6172b19ae31927 SHA-1: 514776a4e5b07da11dcdc7a333955a9d338aa667 SHA-256: 0c41d651c04593f69f361e385bcbe9508be88338d6741da874186f1c39626eff
156 Risk Score

Malware Insights

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

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 embedded URLs pointing to external sites, some hosted on compromised CMS uploads. The document body is heavily obfuscated and unreadable, suggesting it's not intended for direct user interaction but rather to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://petrovsky14.ru/docs/files/zevefutinukexidikuredatu.pdf In PDF document text
    • http://studiozammuner.eu/userfiles/files/lasinesaxegivobab.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/f6e7b4iob1rc5q60pec0qt623k/18254830050.pdfIn PDF document text
    • http://craftland.de/res/wysiwyg/file/ziwuwuworuvig.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/94043624270.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16137824074402---53965045169.pdfIn PDF document text
    • https://trsoftyazilim.com/genelresimler/file/13709140412.pdfIn PDF document text
    • http://halmar.info/userfiles/file/sorukuda.pdfIn PDF document text
    • http://flirdining.com/uploads/files/49574863966.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/davusuji.pdfIn PDF document text
    • https://xn--80ag1a2a.xn--p1ai/files/file/16604238686.pdfIn PDF document text
    • http://riviera.az/userfiles/file/67886696707.pdfIn PDF document text
    • https://cooperspick.com/files/zosojodoxoguredugeluk.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/jivuvususawenusaza.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/xepapatizusanab.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/d577c11e61e06a18e2f3aa6a1423b285/62295088861.pdfIn PDF document text
    • http://atanasijornet.net/uploads/ckfinder/files/pawevoteferatovonufof.pdfIn PDF document text
    • https://cartolmania.it/file/31163709882.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16145aae019b76---kulategite.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/zimoxerifabepusovawoka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=queen+movie+download+hd+kangana+ranautPDF 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_off0000af16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC728 16288 bytes
SHA-256: bf981dede2a6b1b7e8f5da56df6cafb5d2410e5b7e57831491ac0bffdd8e02db
font_02_sfnt_off0000f0e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E9 10928 bytes
SHA-256: 36ff00dc412939935717a32ce672617b545fdf0324d7a4d275f4fe99a600ebae