Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a3b36cbdb1bc45e…

MALICIOUS

PDF

74.2 KB Created: 2021-08-13 01:29:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5d85a6ff10192d73ea31b4c6c62ab095 SHA-1: 2ba452424774b297bee9491b7f5d58ab3fd8af6a SHA-256: 8a3b36cbdb1bc45e6997b01f18e60f0eae5f8e5c0bb1d3d25f8ab4b09d5959f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs that point to a variety of websites, many of which are hosted on compromised CMS platforms or disposable domains. The heuristic firings indicate this PDF is part of a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://irlanc.ru/uplcv?utm_term=2005+hyundai+tiburon+service+manual PDF link annotation
    • http://luxcottage.ru/stroykamen/userfiles/file/jipiganawu.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607015b369a78---xewimo.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/jujenuguxafadar.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4ec1e7fbc---61515746990.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/45571497277.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ca8b6d68f---73492109841.pdfIn PDF document text
    • http://amdind.com/userfiles/file/55654114099.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/4fcime4ta4hn80b9qh20ekooa7/nizawozugamonujuse.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1193e2139---firasunedolosumejavogir.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/89089900869.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/vezonurozodalovoz.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/92004788806.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160826118ccc6f---jugawafizuk.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/woperawosinivi.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/soxunati.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/19857677108.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f82f0fe60bd---kuwujotunujumake.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/11063774973.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/kukotuxijigifusivo.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mobepotuwediferizogi.pdfIn PDF document text
    • http://amdind.com/userfiles/file/vosavor.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ff5ed5b7a---66318729625.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/4bc140d10aa3674b7775b9b764dfa311/tosebigewewevasited.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/81e804653a6aed6191b2ab73c5177bfb/90132115188.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_off0000bfef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFEF 15896 bytes
SHA-256: 3d3c3a7545e91d0f4ef27a5fc90cd338ed2d4b60f08e567a4d742bc6242f7da8
font_01_sfnt_off0000e900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE900 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10117 11336 bytes
SHA-256: d718b81e58f318630a8eafa54c8aaff609ebd60a7092078cb05d4080f565c2b6

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