Malicious PDF — malware analysis report

Static analysis result for SHA-256 7810a3c745deda1f…

MALICIOUS

PDF

81.5 KB Created: 2021-09-07 23:00:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 991939de8e24b6d1f5dc1bcac32d2c9a SHA-1: 06da46726910a2dcfb1f92ebb2548914c23919ee SHA-256: 7810a3c745deda1f3024ac629521f356eae8b5c62c509094a04930ef90bb1c24
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely contains an exploit. The document functions as a link farm, with numerous embedded URLs pointing to compromised websites hosting other PDF files. These secondary PDFs are likely designed to deliver phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/3a38163476b255ed87668e2384506128/gusapemasetevor.pdf In PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/sitorogize.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/bexotagabo.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946fe724a73---34367930303.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609657423a811---sojizuwudowuni.pdfIn PDF document text
    • http://moretonassets.net/userfiles/xisoxozelifofe.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/15479548610.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/c8ad788f3d934dbf605abf6eb35c6b9e/46564422240.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d2182d13b31---lesurawobivakavezabamezu.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/2c7423af13739c83ed76b19e0130df67/35389889247.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/2386107102.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210729163810-fetoriretofejaxapokam.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/88422491219.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/00e5d81ddeeca5235712f2c0e79c57c6/velonuru.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/bd23265fa8d8a8f999480fd195a7bb8e/fazivemugusolovepasoguni.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gikadow.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/zutemideturilonawis.pdfIn PDF document text
    • http://holycrossyouthministryasp.org/clients/f/fa/fa15eac34f6f8ef5a8ada011ffef1578/File/22852153537.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/24212708701.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/5258762516.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/69f3f78a70b65072dcfe60bb7f873cc8/jokavomekixav.pdfIn PDF document text
    • http://www.kilincsweb.hu/fileok/file/62336509855.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=an+inspector+calls+critical+analysis+pdfPDF 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://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_off0000d76a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76A 10708 bytes
SHA-256: 3eeb2ba12a614a237a73b1512fa8fff89cd751b645abd612609b7be7787f61c2
font_01_sfnt_off0000f026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF026 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10838 18916 bytes
SHA-256: 120764ad874ca6603be34d522a3c4195ec1a19fbc8479b931a98beac2a3b0a7d

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