Malicious PDF — malware analysis report

Static analysis result for SHA-256 61c815fbe3b48d61…

MALICIOUS

PDF

97.4 KB Created: 2021-09-02 13:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c765c3721563a91c33ce5aeafb048e9b SHA-1: f930f9a9cfc946b777470bb209b5808f6b13f90a SHA-256: 61c815fbe3b48d614f5144790b6f3bf0649fd3b5dc0b93f4e5b989549a3aff74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised websites and disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://coretry.ru/uplcv?utm_term=bach+prelude+in+c+minor+guitar+pdf PDF link annotation
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/02237671126afe2be86c5df15237cb4b/suxedaxekadakiwezowap.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16106e47a80080---vutuwofipodajuziwubage.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/70848485426.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/jupetelopozo.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160822ef624434---fixofudirek.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/2019985465.pdfIn PDF document text
    • http://goergenpainting.com/clients/0/0d/0d1038892961fdbf96b6a8e7e8daca8f/File/54157250725.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/25461771128.pdfIn PDF document text
    • http://niktid.ru/userfiles/file/77695266358.pdfIn PDF document text
    • http://www.olivier-frey.ch/user/web/file/nepopibagexuporomirufe.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607754e223d02---farif.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021072523073073499.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021050506323934.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/xumilap.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfac4f88bfc---tuxodubip.pdfIn PDF document text
    • http://nieruchomosciklodzko.pl/files/file/89524995434.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/80184738253.pdfIn PDF document text
    • https://fallsplat.se/file/xufujesaxakin.pdfIn PDF document text
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/noperazokijizapokevuzo.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/65e87ada1b8433ff6ab8d1a8065b22cc/62127456796.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/62096594659.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720a0a27d3a---59606673007.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/fegavikikumeraguxigekena.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f05b33a453f---60251059658.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_off00010f7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7F 11052 bytes
SHA-256: 8580d9f453fce8ebe84adf71b74884ff94fc62371f26da64b108c85efe38fa3a
font_01_sfnt_off000128d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000140e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140E4 21896 bytes
SHA-256: a3dabc6097d6f4bebee69fcb708288d78b14fadfa107c3714e54783ccd413500

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