Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c3e4be5f0f42e2f…

MALICIOUS

PDF

78.4 KB Created: 2021-06-19 15:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 9a1be398932d1caa8c82154bd0fb82fb SHA-1: f2c329811a500dd897358062460f95ebc4d014b9 SHA-256: 3c3e4be5f0f42e2f6223b564cccbe503118d051f71dfe9bf406cf4cd5c59d94d
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to multiple compromised WordPress sites, suggesting it's designed to redirect users to potentially harmful content. The embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608172399fee8---58179860856.pdf In PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/cn8buonc5ijole01p0lc877f3r/bigofuwejiwiburidiwerepo.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/hjieutda0m4k1hbvh5gm3fu8a6/67611787276.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/ot2rfpqn5tnmhimc109gg94rk8/fonagun.pdfIn PDF document text
    • http://vintageguitar.ru/ckfinder/userfiles/files/vijegikerazekusijuma.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/d10b0a70644686ffddda3035f3bdf606/bulawuwefit.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3e2132df2---89197377770.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/e88785f510c86a339be1f705f7a6f300/zidawur.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/lufelorad.pdfIn PDF document text
    • https://airshow-bg.com/file/nawimodepozilepo.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b256190f651---welidizotu.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/3oc8tbqsm6qn7phlhelc4nj03q/67715835082.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/h20tnqdghpq1i0o7cltsd0al5e/fagap.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16096c2a757d44---noragebovad.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/lusazegixisafowusemata.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/8d75b3ca9c9abac9655a623a40248242/49869164567.pdfIn PDF document text
    • https://mfdesign.hu/files/file/gakixekebomikobufu.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/lamujijitowewujatepe.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/47747924340.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=3d+model+rc+carPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF580 4976 bytes
SHA-256: f8bf9e7f67b242f2151bdc11ec8e0f8ed596ad879ab0ebc4896a5af9936be519
font_01_sfnt_off0001064c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064C 11148 bytes
SHA-256: 3122df36c0f5a354402880e8964932604929bead314eb35ab8221e634d06325c

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