Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6a39b0a07e8db99…

MALICIOUS

PDF

54.4 KB Created: 2021-09-01 12:17:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9f3a24d25aa0f219c39555982001e7c4 SHA-1: fd25ac47011f769485853b1e2f20b604c893fcab SHA-256: f6a39b0a07e8db99644500b6ebae0f6830426c5e06951b49670635aae96037c0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites used for hosting PDF files. The presence of 'utm_term' parameters in some URLs suggests a phishing or SEO-based lure. The document body is heavily obfuscated, preventing a clear understanding of its specific content, but the overall structure and URL patterns indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9414

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://irlanc.ru/uplcv?utm_term=toric+eye+meaning PDF link annotation
    • http://kondicionery-vidnoe.ru/upload_picture/file/zosatu.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210729_174256.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/9529075899.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/bqffieochqdnp03sqg35dhbi96/kixulovinikutaweme.pdfIn PDF document text
    • http://xpressup.com/userfiles/file/pulosigip.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/d7507045e5806402d9e328d9ec056dba/49710327303.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ca43ba0f4---mubepomidakilesok.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdaa6daa100---povuwasebolur.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/2045541737.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/0bdae58ea078369a3630ea5ab005a1a7/jowivodewomefajul.pdfIn PDF document text
    • https://ecole-anglais.com/upload/files/wasanibiduwovifi.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/91cff29adaaab30d4e2d8dae5904ce4d/xamazidiferelerobowezo.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/xezewukunisepunetavizo.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/dijurazafemulusazonigu.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/nee1t638e8uit2t62fdm8peg4g/pezuxus.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/xuxivulenuwatow.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0f0bc306b---dutibedonijobetozaw.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/59333406727.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/kuxodizowikufabite.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/3a20479cfc7b4a6bb16d8ad9e076c079/29160714886.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16070cbIn PDF document text

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