Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bdce901d3562e65…

MALICIOUS

PDF

93.3 KB Created: 2021-08-11 11:27:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8d054a0bb3f4ef1208ebf8941962a8b5 SHA-1: fa28bfe64257f923f788fe95462b0727575fe9cd SHA-256: 6bdce901d3562e651b648822b0ed2d9944ce50aca922f70d9b20060e7d80c493
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload directories, suggesting a link farm or phishing lure. The PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://medvor.ru/uplcv?utm_term=is+paternity+a+legal+requirement PDF link annotation
    • https://bestofbucerias.com/upload/file/14758399664.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/utjsanr09upnogrtrp0uogc380/11811560726.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/21564131871.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/kanikonubumo.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/fubomopodogekegujepatav.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/vefulokamunapikesokaridu.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202107021608035675.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608683cfd220c---74494751822.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4e7e67706---niguzewilokipa.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kovurojig.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/23819ea03efe19c7caf7837ac25c1e30/1849185331.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078d3f5e9d7d---98278418838.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/bawubasumekejuj.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/fodubowosababinaxexi.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da50adb157---rutalufaniju.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/tekajik.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/xuladofifavasapenisina.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/fegitapuw.pdfIn PDF document text
    • http://dabbleanddesign.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/75460256745.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/0140c106b4639b196d88f8557b143314/sojumopivikubukewuba.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/15274203336.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2152bdd1f---dawelosusajitixa.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/1af447bc837b003264da7d6254b134fc/82829390801.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2bf4c0a45---saneduvogojaporivuta.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c546b5c4a0---83158430954.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_off00010b4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001235f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235F 16960 bytes
SHA-256: 6ffdda1df7c25578e6914200a17f3a01b67dcdc66f6bdfb7ee81836ae8d78328
font_02_sfnt_off00014f56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F56 10784 bytes
SHA-256: 6ea1a40d036bc6e9cfa4f0ac94367a5a7f898230fb20506ef87ff74a7fa6aa5e