Malicious PDF — malware analysis report

Static analysis result for SHA-256 40220c2fb5059643…

MALICIOUS

PDF

94.3 KB Created: 2021-08-09 19:10:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: add3972bb941024a91f9cef0f0173685 SHA-1: 6e0692cf04347d714d81886fceaf476e58786734 SHA-256: 40220c2fb5059643898133679f056a350b84f8214fa1cd9488b0fb920246d828
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external sites, many of which appear to be compromised WordPress uploads or disposable hosting, suggesting a link farm designed to distribute malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download a password-protected archive, a common tactic to bypass security scanners. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://irlanc.ru/uplcv?utm_term=how+to+unlock+pdf+without+knowing+password PDF link annotation
    • https://eniedu.com/data/file/20210807054653.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160734e831e1db---kebimovasoboxujakupevel.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/ujf803fqnc4kjq5qg4m4tqoqk3/dimub.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/gfqp2v24jpvc76rk07pfi85edt/78573426345.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/mudekevegifopipunolo.pdfIn PDF document text
    • http://garderoba.sk/images/_file/nasepobegojedi.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/fodudenanevet.pdfIn PDF document text
    • http://universe-micro.com/upload/files/20210625_002438.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/e027f26b3659fca25b69bd59233acbcb/6698433173.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/82484067774.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/dokujunepidiweposedogevon.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/d5240ef9dd4151f40981f019b710bd62/54511893839.pdfIn PDF document text
    • https://qigoodteam.com/uploads//files/202108021426252782.pdfIn PDF document text
    • http://schs1968.com/clients/861610/File/31637550709.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16091c51a4bf18---xibepab.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/eda2de5f32d6127f75f7a970077ab451/8737613697.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/gkcipgg3nn7lno6g4ca8h1j16b/80231763033.pdfIn PDF document text
    • https://abeess.com/userfiles/file/bopipisuzuluwugilesas.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160971f66aa7c3---76187176764.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/durufulesobejanido.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/88851224204.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/kakosezakowalokazal.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa7bf203a4---xorudolezonal.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_off000107d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D9 17964 bytes
SHA-256: 1442669c2593e54f491e6bcb2a80f173cd8db44ba94f8a4da14c51cc57cc07d9
font_01_sfnt_off000136bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014ed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ED3 11036 bytes
SHA-256: fadad1f281d538f1d79f80111c17f76fb0fd2de88a56bc96e4edf0b1d6d79d27

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