Malicious PDF — malware analysis report

Static analysis result for SHA-256 39f5170ad458695b…

MALICIOUS

PDF

68.8 KB Created: 2021-06-16 16:06:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 7ca1847eb729a8e0025057d1dedf6e33 SHA-1: e731b738195d2e2f02d46fd0db46c2e59aa1c056 SHA-256: 39f5170ad458695bc1c1c1ffadcef902639a03a87d11bcff883ea4f77de5cb27
156 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to various domains, including compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The document body references a popular movie title, likely a lure to disguise the malicious intent of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=frozen+full+movie+123movie PDF link annotation
    • http://ctkupavna.ru/upload/file/23960443826.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/dakakeneriragimirawo.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b2d4e8ace---kutonozagawawuxorenuz.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/zovuvugu.pdfIn PDF document text
    • https://ecole-anglais.com/upload/files/44234206277.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/820ace7971ef70cdb40548ddcb1059c2/13015435542.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/bilakivujuwutew.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/27ee5ae58480cc50093269c66a1860a6/41184179530.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/364f48ec4e721f967d2cfbbae0d34296/76889266512.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b454c85a8f9---sedulore.pdfIn PDF document text
    • https://aedwea.com/upload/foto/49677583387.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/wisetugora.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/suziponilamudam.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF75 4936 bytes
SHA-256: aeb9de476aef9db393d550a9cd1cfbf5eb9a387dd6c7ee095c6d17745bd8287d
font_01_sfnt_off0000e04c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04C 11420 bytes
SHA-256: 5b2d48ced54ead7e44b734ebc042a0e0a41746ee4302b43037a0ef0b17a5391d

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