Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc6a59b010aeb319…

MALICIOUS

PDF

85.0 KB Created: 2021-09-01 08:26:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c537014e8cee104cefcf88df1fe684e3 SHA-1: af9bda1a1cbb31fac4f976146a181307739d052c SHA-256: dc6a59b010aeb319b9d79eea9ad982a7a30601bf47b754fc296958a3e89535c3
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 ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other potentially untrusted domains. These links are likely intended to redirect users to phishing sites or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/cc0b7391d8f04b33dc3e8513708a8bab/filuxurumilamezovoz.pdf In PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/d0aae54ed23df4b5964b131a6447cf51/turipiwudakuzogokadeba.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/bifodataniwe.pdfIn PDF document text
    • http://africareview.in/userfiles/file/duvimabiperopabi.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/jafupuliputekiburoxuxu.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/0461425b430c70f3db5decd3e7855387/46129250225.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/96995554543.pdfIn PDF document text
    • http://consade.com/userfiles/file/45634998033.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/70123038623.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/37037179592.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/xuledolifudorafezes.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b757ca7c33b---fagusimarofovigi.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/cp5mekft87vo863skjke4vnmf0/nawigekigusozavos.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/narimiwipuzofugunipab.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kozadobubujuku.pdfIn PDF document text
    • https://koreayokogawa.com/ckfinder/userfiles/files/safedupipomipusar.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/vixatidaduzudujezoxudi.pdfIn PDF document text
    • http://talleresjpg.es/img/file/kapunoletegapokizomomisuv.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f117f19244---65648676886.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/56907581300.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/80795841025.pdfIn PDF document text
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/93797161195.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdcf8ae49ae---mozuvimita.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=competency+based+interview+answersPDF 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_off0000e655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE655 17320 bytes
SHA-256: 3f4f36da4d6f0059918e1a4780f076af567a8995435222d8248697de98bd4d4e
font_01_sfnt_off0001129f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129F 11064 bytes
SHA-256: c7f2bc4a5ef4916f984d32d0e02d666325094e1cd295d36bb06123e5fa8039e0
font_02_sfnt_off00012c44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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