Malicious PDF — malware analysis report

Static analysis result for SHA-256 3676b6a9dda94ea4…

MALICIOUS

PDF

88.8 KB Created: 2021-08-12 20:54:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: abf445c3b26617404429e5f8149df89a SHA-1: c40e9eaa93cf3ed9a4845e151d65392a7fddf945 SHA-256: 3676b6a9dda94ea403d0dc89b0bc8b9f862e50e10033ce84595555ea50d3149e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various compromised WordPress sites and potentially malicious PDF files, likely as part of a phishing or malware distribution scheme. The presence of multiple external URIs and compromised CMS upload links suggests an attempt to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074466f65ab8---45616575876.pdf In PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/dcv5aijatreo8s0nr8knfva1iv/farekuwojanovif.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/85907763389.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e08d933b167---86069048598.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/28tca6f38ca6elgjpmaetsgrp0/64474821720.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/dibovoguwesokejativawi.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/66774050384.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210622201019.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210628_26CC5EA7444D171D.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/eusi5p5ms1d3kpif3uptskp41k/mulojitumutezoxuxipasar.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8859f69bb6---lukakepavanuro.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/xogomesozodefenefug.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/69487606305.pdfIn PDF document text
    • http://gibisch.org/files/files/tuxuvixakomiwuzuzet.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/9527453882.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/jovadopebafokagefusubuko.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a10a11bfb---vudononozuw.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/86957741708.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607104e3af91e---62079446880.pdfIn PDF document text
    • https://xigmatek.com/upload/files/jelajaxugezavetizo.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/lefapasubetudorexeribame.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/ie42qrvmbrl3djrpe2ggika5qg/xexilovaxub.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/5a12027be20cff45daac3d17d1c49114/73032847554.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/rurovixevasos.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/58946634141.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210807162634.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210730_7689D4658EDF47A1.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=all+bollywood+movie+download+1080p+khatrimaza+mkvPDF 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_off0000f4a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010cb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB7 11412 bytes
SHA-256: ee9f9165ef0806057f0ed5d3ef7ce2e8f7f7ff5b17538023176912e958dc5f91
font_02_sfnt_off00012758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12758 17492 bytes
SHA-256: df6086eb471ee9ca1bf8281e4fe2137519ec52c1aaa8d83da311559ad1029a84

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