Malicious PDF — malware analysis report

Static analysis result for SHA-256 79387ca587fa26f0…

MALICIOUS

PDF

69.3 KB Created: 2021-06-13 02:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8526b8051d4a3ec1a98f1fe5e2f5f25 SHA-1: 9e0c04c4c6ad181644f8c9df4929f1e1c9faefd4 SHA-256: 79387ca587fa26f03554be84e58104ee3b39704d56bfeaf0691e34768be614d2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous links pointing to compromised websites and disposable hosting, indicative of a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are sufficient to infer a malicious attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9684

Heuristics 5

  • 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
  • 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://smidgel.ru/uplcv?utm_term=ella+enchanted+book+read+online
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2ef053bb4---zoguwugipamifitopamibudiz.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/01c8631c8e8a80ebaeddbd27630e1878/66526072107.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a663b667c6d---tubonevur.pdf
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/37001819875.pdf
    • https://pass-eco-energies.com/ckfinder/userfiles/files/xubadipiwopafe.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ur9he7fkkskq9ads5r004fc8j0/dineboribit.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e53f4ccd17---45086902435.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/7455137e4556741441f0feb6399bf9c7/neguzefazamewebatapewet.pdf
    • https://hkparkkonutlari.com/image/files/81332209725.pdf
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d481a50b13---91515806069.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16090e9e076595---bewafemusivejit.pdf
    • http://panziofabian.hu/fck_kepek/44733546996.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab79e5e6da---91372404914.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f058f3f5e---92874645867.pdf
    • http://icltindia.in/userfiles/file/43555716674.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a416c6e7783---47899093331.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8d1.bin
d3d4656818c1cc800a77154b60fb0e8eb32cc4667e4d6f2a2404c5ab9629f0ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D1 5012 bytes

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