Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6c5bb516cf378fc…

MALICIOUS

PDF

80.0 KB Created: 2021-09-07 04:57:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d7180d1b7c53e691db05a5fc2dd0c8cf SHA-1: e5338d32aaaa8216554a4448528d94ca45a0357f SHA-256: a6c5bb516cf378fc0ab86001402c9bc0189258d518bc83fba415917ff9d73885
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and link farms indicates an attempt to lead the user to a compromised or malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/1itqft5o3nfea88brqu3lt9pph/xetokilusajuju.pdf In PDF document text
    • http://targhevaticane.it/userfiles/files/xotagolamajokakozizavop.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/5547c31156b5e12bfe88b5d2d3ecaddb/terenis.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/mepupisowomajejeg.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083adb463f0d---sixodime.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/62853189901.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/6712012476.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/15601281688.pdfIn PDF document text
    • https://latework.cz/soubory/vilesupimowu.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/01s4pa6v06r8vuv421vq43o4vi/wimuzalonabina.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/90460289571.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/94144222376.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e929e36f5bf---98806978778.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/38296425031.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/3pgd6mh7mam7m4mnst4ev7jfqi/61606042739.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/1ae0db38bb456ff0af3f3f96be9b03d1/70206383026.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/60549516757.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/4uuqmovpk2dnuug2emi045u60k/73020394240.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f84b16def0---mabodewafamix.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/64100199726.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/werapavavixoborikutore.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a26a06b8f2d---67231835293.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa30430bcd3---49089875384.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/wupimodepa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=cisco+essential+networking+note+pdf+free+downloadPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/6410197f3d57abd75c3a9065880ccc25/17193734193.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_off0000d1b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CF 11004 bytes
SHA-256: 9a572946cdb809ed1252a12f2187723097fbc91239c8c8959f8ad12062e86ef8
font_02_sfnt_off00010369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10369 17900 bytes
SHA-256: a635df6bf7be02df270e8c0d97ef343cb16ebcda6c2f8789de7639e548a36b25

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