Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f5efb24133946c4…

MALICIOUS

PDF

92.2 KB Created: 2021-07-21 13:41:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6e8d5acc3c506d35b26454f9b31f1733 SHA-1: 1816c4cb6dccf76986d415578e1e34323bb84b8b SHA-256: 0f5efb24133946c4e775426756948b1b7e74c2d1ec114f340dbad376601c30f0
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as a link farm, with several URLs pointing to compromised WordPress sites. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The file likely serves as a lure to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f47ed38ebc5a5d4ffe0d1dd54a095c56/89545931154.pdf In PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2de4b8173---nokakifozu.pdfIn PDF document text
    • http://caf-ljubljana.si/docs/25677204006.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd516e7073---5057139106.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/gulokofujetepirokugubena.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16086a5876292f---xegoto.pdfIn PDF document text
    • http://salinahighschool1968.com/clients/3/33/33fcb9b832a528c934b1ac42c6b88a99/File/murufagidaj.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc91841842---pesovenerup.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/fideno.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/34868770233.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/qvsorbuvjpf32fej6sssbhe641/xukitiwemebapefotani.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/04f7e870569670f813bc652dc280283f/30075733527.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac05f592922---libiru.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/vivusumodoviv.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/zufidijizuwamusikabikala.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/55845318256.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/985654e3103c3cb14451b7dca6f94355/kigas.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160703ae59dac2---girogolatobewidokeju.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/61660350489.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/93846992038.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/mofirogaguz.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/tokebipuw.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/sah2m1dng7fa7drq8nsbbob4ue/76688229807.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/10752201736.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/82167436572.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/7b58b3a26c0551bbebd72c3a8a783e15/zezofofexoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=morality+in+african+traditional+religion+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_off000107e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E5 16468 bytes
SHA-256: 691878c63849061a87d5f8d7d00721d0bd11644bee7a69ddd865df3d33023f1c
font_01_sfnt_off00013289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13289 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014aa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AA0 10732 bytes
SHA-256: fc2d0be0cb689c75e74f129c15fa1dc46623b83ecd21789e10a560f363ba563b