Malicious PDF — malware analysis report

Static analysis result for SHA-256 4be2cb0c0ef35c1a…

MALICIOUS

PDF

72.1 KB Created: 2021-09-01 08:33:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a4c0631bbcdc73323892216ef8aae5a0 SHA-1: ec049b339014e705ecf1870bc5d292c7941318dc SHA-256: 4be2cb0c0ef35c1aff0e0bd75ce76453ac46e80d73f0cdeeefecc8b13423e486
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm heuristic indicate a malicious intent to lure users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9db1be53c---65672603633.pdf In PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/acbd72e7b7ff058182015567e0b4c0d7/gojojabivesipobegubara.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c94bba7c93c---xedavilogazitobi.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/60021029491.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/irparnmf9vtn2dcbu19h5n9ao2/78129516789.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/b4ce433b53323e9c32472f27c59e56d5/97665440168.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/72728728757.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b29564bbabd---68870392134.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/ruvidokikim.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/fc422a2717d91fd32c6b177413b254d6/duxos.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/h10p0mra0kjdog3srvlh5i2vji/56444544507.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/32334518645.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/a8d47468b5aede4191805a6c2cf2e13c/gasatuzol.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/29113293676.pdfIn PDF document text
    • http://genarchi.com/data/temp/file/36488639813.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/5c7b80117c30c0aa3fa0cc94dfec3734/dowimokemisegazikon.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/xujipawar.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/vopiwafe.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/lamej.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/611f086g9km7343a6uc80bvq6v/63684752378.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/29208275987.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/duxizizusigudujabonebabu.pdfIn PDF document text
    • https://85097781.com/upload/files/sijirenujimavaju.pdfIn PDF document text
    • http://polletnv.be/uploads/files/90759870565.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=the+important+book+lessonsPDF 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_off0000bade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBADE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F5 10712 bytes
SHA-256: 1775ffdb6d0c5da9e67cc015880113dc2971d695beefd148b505f81c7a145f1a
font_02_sfnt_off0000eb1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1F 15480 bytes
SHA-256: 5c0f09b28d3cbe4ee183d08842732e488ddd304ce8ca8fcb2f5e4310c0cd1109

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