Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a142a171678d946…

MALICIOUS

PDF

81.1 KB Created: 2021-07-05 19:06:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bd6c843f905fbb172897edc8b847af4d SHA-1: a8acf4888b58b95f154fb69245a2f46e10db2cbc SHA-256: 3a142a171678d94682f2dd892ba1ee253ea8806eecdfd4eba53f02ff2e4adc69
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains numerous external URIs and link farms pointing to potentially compromised websites, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the nature of the link farm heuristics indicate that the document's primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://drafthe.ru/uplcv?utm_term=new+hire+performance+review
    • http://klhl.com/userfiles/file/35038846.pdf
    • https://prosperitas.be/data/assets/file/dajulamigigawelosutiven.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/fb50ad4d94ac000ef9f7f30d4ad62b56/dewiduvixava.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/fd039819114aeda739d3026768ef8bc8/wibabogodetubikusunikab.pdf
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/76402219425.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/cdfe5506c01fce8cbc92fc5b61aab8b9/81539538800.pdf
    • http://dailitara.lt/bites/uploads/file/23576961548.pdf
    • http://henrycrawfordreunion.com/clients/1/19/1929e20d1ffebcad6d8b2a659e9c170d/File/zowokobibe.pdf
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/revawosenapopami.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff604961b6---vopegupomijuwinoj.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/052ce72bf6c7916a71e1181733937a1d/74485072455.pdf
    • http://owtsreunion.com/clients/e/e7/e717deb27d844c69ffc49b2d3c0bb1a5/File/basojugejakokapanuwen.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa62948692e---58456719662.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/cde0abefb86a4d2166f1c60d213ac163/wesisewinerorikinowim.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfa1c93232---botiborusipefazovelodosaw.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160a28b5ecf017---polal.pdf
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/4c31c528ba5a05e877dcd34f5c367a8f/goleditedavivemug.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16070102c4c27c---24620348862.pdf
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfe35d3ae7---95940507632.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/gt1g5ibaigtn2c3sujftkkrj5m/libanagekin.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160780927090f2---76077678591.pdf
    • http://maskaevlawyer.ru/userfiles/file/gataruje.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a176578c7c3---wadumule.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc7571660b---kutefitogudojobinuwoze.pdf
    • http://ankaser.com/userfiles/file/putun.pdf
    • https://nhaccugiare24h.com/uploads/userfiles/file/9549873034.pdf
    • http://sistersaviopublicschool.com/userfiles/file/jixapewe.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da3d.bin
cc43e4375e4f080bb1a4f44402cfc9f8dde8a270bf3289f1b6c351401f4875a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3D 10564 bytes
font_01_sfnt_off0000f234.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF234 16792 bytes
font_02_sfnt_off00010a46.bin
dced2589d577c9abb1a1b8a67dac16343d66c89f2861ff46f58e18267b641be1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A46 16680 bytes

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