Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3295e9b67cecfc7…

MALICIOUS

PDF

88.4 KB Created: 2021-08-08 08:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f098d69829b1a32f1b57955837d07b59 SHA-1: e31de777a859de54583e4362d7f1648e98b0ead9 SHA-256: b3295e9b67cecfc72471df236dcd19e19776679849940c697317ef60cc5e8ef7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains embedded JavaScript and a link farm pointing to numerous distinct hosts, many of which appear to be disposable or compromised. The embedded JavaScript likely facilitates the redirection or execution of further malicious content, contributing to a phishing or malware distribution attack pattern. The presence of numerous external links suggests an attempt to obscure the ultimate destination or to leverage a wide range of potentially compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://ekhoron21.mn/uploads/files/12313858772.pdf In PDF document text
    • http://cpgny.com/userfiles/files/9263229939.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/10954569125.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/6667995cc1beac2385ee10a01c26fb75/96656363123.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/a22b7860ffd2badf0c0bccd0144b5f2f/xuvajetujuwubiroja.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/60203667740.pdfIn PDF document text
    • http://gaskinfamilyreunion.com/clients/b/b7/b798c9f9e2af69c3a5b950a06e4ade8e/File/77731668196.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021051912531673499.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/91293848470.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/78ed731b5a063ba46a606db86d4a0e55/33819395284.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/2ddad39eb685ea44f2d2034083c7199a/79626181202.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160b974a5531c9---sirofudunumoledeludufaxu.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0559cc440c---57348320291.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16091c57a8627f---gavok.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3ba52c2b1---nuziwebebufejubidofa.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/76102093181.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/77889249242.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/penafokepedifotukiwoleve.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/kevipopepexul.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b9944e5d7a9---46753474057.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b4317245c52---jalolekiradekivakuli.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/xenaxijodabudi.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6e5e9d9ac---toremekonamosefebijawe.pdfIn PDF document text
    • https://promise-land.com/upload/file/depuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=oraciones+bimembres+y+unimembres+ejercicios+para+imprimirPDF 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_off0000f0c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D8 10900 bytes
SHA-256: 1e14340064938fb5460f1c55f6698d9016ffa12bea6b5cc0ac3880f4e189a448
font_02_sfnt_off000121d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D7 18088 bytes
SHA-256: b00945b5253478cb5076d51cbe7b52fe0734e70bda8f77b26a6f597e8f6f9cea

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