Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2d10e40e73cf21d…

MALICIOUS

PDF

60.2 KB Created: 2021-06-23 13:07:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b99c0e310805e8c2012af294c49c5a3b SHA-1: 3e0f0cf3bdfb819c08c7fd6f3b106fe66d2657ef SHA-256: c2d10e40e73cf21debde57cb37cd25c36c0277f8e6bc64a1c7dec4b633180f5e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/d3d1295478db6cab01f5740d26fd43bb/menedifagijuxulusaj.pdf In PDF document text
    • https://cleaner.pl/userfiles/file/xipisudazamatep.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cad644974d---rewavep.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41b9f74edc---1161265004.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/82735d042cbb339ddf45975a000be476/wemisuzudivirar.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/d842f88135f4278019629aa6dab897f9/xotolevizibaxewef.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/rimevunugamevatimin.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/cc73bf44fc9143883917c883b8a18aa9/mekogukomo.pdfIn PDF document text
    • https://nadamasristorante.it/file/22650733280.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/27741151855.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/zopiziripupejifatufazo.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/28047358760.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16075eb7ceae33---61017608867.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/12365708884.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/76617300854.pdfIn PDF document text
    • http://furniture83.com/upload/files/47813347839.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/~3/1xuhb7AK25c/uplcv?utm_term=photo+grid+collage+maker+downloadPDF 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_off0000b10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB10E 5332 bytes
SHA-256: a90d9077f656fa3bd488bf61aa788083869082203ef2233b478a2ddbf2a4fd36
font_01_sfnt_off0000c315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC315 9584 bytes
SHA-256: c19ba993c820200b41364d4c98eaf402cbd913ba278d493b73db54206402b4ff

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