Malicious PDF — malware analysis report

Static analysis result for SHA-256 efbf3b8f2b99d6d9…

MALICIOUS

PDF

89.1 KB Created: 2021-07-30 17:46:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 72b7a04b5e8b99f708b742511f541658 SHA-1: b4a93ff7122f2b19eef4047dba8542d3aad29d60 SHA-256: efbf3b8f2b99d6d9d52059c17c81e557166444d475204bd08e431914655f8737
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and the presence of external URIs strongly suggest it is used as a lure for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://crewmak.ru/uplcv?utm_term=funciones+de+la+lengua+poetica+ejemplos PDF link annotation
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/27d1e3e0a4997a4b1d8fe4a971ea712a/76845557322.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa363419e75---56921057855.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/kufavajapajenapokosuzifo.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/8bf5rts7dvkejg8e33hv59lobc/xinuv.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/39891949141.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210530045655.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/nunuzaxena.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/e886c951985411b2d40fcc72ad140273/29097876415.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/90814504622.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/778564a50a1a8cba62761833c7e0117c/88756920807.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606e7072c23b7---fetolariwuronowa.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/vugejevinujuv.pdfIn PDF document text
    • https://songuryazilim.com/calisma2/files/uploads/94980962838.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/sabezelibewiji.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/ujgm1c8nh552cb49jg6pek8dq9/39978382416.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/96380625837.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/xizor.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/59101433242.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/92709092975.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/22565690594.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a94505c7de8---42838347679.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210706095843.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/0c0d48d5d7f0ea0edb572e79386c982e/sidovomuroguzujuxewodi.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/35928366628.pdfIn PDF document text
    • https://ahha.az/userfiles/file/23110027114.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_off0000f499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF499 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010cab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAB 18168 bytes
SHA-256: 6039d3d0eb189817a8f12794e544551fb3fccdeb3669e49b4dcfe158f4dc1ae8
font_02_sfnt_off00013a55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A55 10964 bytes
SHA-256: 4b8f376740fee04c1e002b9eaab58458ff8b879e3a12d5089a0073a322dd10d4

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