Malicious PDF — malware analysis report

Static analysis result for SHA-256 36e485632ed4b9ed…

MALICIOUS

PDF

84.5 KB Created: 2021-08-06 14:07:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e5cf6fcdd25ccb51f2b54234c9c702dc SHA-1: d288f52195b3a44e20cbfc7658cda723437677dc SHA-256: 36e485632ed4b9ed0626461048f6ddfac7aa32e6e80bbb9c290a1f25cca27b9b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via a spearphishing attachment. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9574

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://krisoc.ru/uplcv?utm_term=what+are+the+characteristics+of+a+transactional+leader PDF link annotation
    • http://orhs76reunion.com/clients/30721/File/tategitilenobekezamiteze.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/zirobezewesevi.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/50167755885.pdfIn PDF document text
    • https://sunridgecorp.com/uploads//files/202108050945133565.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/mosidu.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bbedb9898---tabex.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/ihdiitvn9b858a2viq8una0tkn/79622748360.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/71581096526.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/15513265370.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/98192859854.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/duxexe.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/narefejabidedasitixuwemen.pdfIn PDF document text
    • http://ihdbd.org/upload/files/jirageboxogudilar.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/fc72d3ffc535a95368b84d1714c5d668/genonununax.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/porogapitefupazuxaviviwo.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086a2854db7e---gapixejisogitifil.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3392deaaf9---wulitupumesape.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/lasivituxalivu.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/43065714084.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160aa84363d12f---48975888169.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/52989451212.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d269cce539f---xexunumoledidofawosa.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/35521025571.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000113fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FE 16932 bytes
SHA-256: d3cc627b9c35e5ffcb9702fb6812ccaa43f5627c6ba94dc4482c6f27791725b0

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