Malicious PDF — malware analysis report

Static analysis result for SHA-256 417c6fa35e910cbd…

MALICIOUS

PDF

84.0 KB Created: 2021-09-02 12:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dcf2f79f3340221cd0bd59e001f19807 SHA-1: 2925e2e5275c5ced6950aff9b60f80370a3f5637 SHA-256: 417c6fa35e910cbd8346dbcce35d05fc5f2952a88157b95f0563799d45057271
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://inwebjor.ru/uplcv?utm_term=racionalismo+empirismo+e+idealismo+pdf PDF link annotation
    • http://creationart.hu/files/file/98777011637.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4c6638153---kekovopojujaxumimalutibu.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/noxose.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca832d9918---fufubadenifi.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/c5cafd1892b5b1b57ce09daad5d25aa5/tibabuturigonularomile.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1606d098b609d9---terukon.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/valabupinodu.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41546ef083---bakejiwupotib.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/11511075227.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/ajv7jj7se3e002610k9h4bvk00/11294404832.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/5e1ad7381127471905da7dce5a840644/18364401369.pdfIn PDF document text
    • https://invest.pl/userfiles/file/11851081059.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/74009050882.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/29351108140.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16093714276552---vasifibavatu.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/iip04fv81vap24guivotaeav0h/423335375.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia//files/36012372243.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6b54808f7---90831980527.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bc73c670f06---41301503462.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/nizogosivijolokimado.pdfIn PDF document text
    • http://montrealpsychologist.org/clients/c/c9/c9c46cd79ea88ac5ae94f64bb0de8c36/File/xilinusejaxaxus.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/cc2f2ebc8a7c8a439474c640626260f3/56129385635.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/55500593913.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/robakovatutunij.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/2622753426.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF15 20320 bytes
SHA-256: c811691d7b9cf30dd1cf5cd1700fdb02052b6fc1112443ca72589783a3f56284
font_01_sfnt_off00011166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11166 10728 bytes
SHA-256: b8d5dc1edaede09ef2ea90774b37b2c15bac5aedf89f6e391a9eb0ef0a838e53
font_02_sfnt_off000129f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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