Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fead03ec1f9db58…

MALICIOUS

PDF

172.9 KB Created: 2021-09-05 10:34:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 220d07c49ffcfe62f5b1c6ecea70be5d SHA-1: 42da0b44693e31cf80e95dc85a7aff12c7251901 SHA-256: 6fead03ec1f9db58246ca0b5cd6ff3c7f29a9beb98f62d9fc4849882b71cba44
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, indicating an attempt to hide its true purpose. The primary attack pattern involves luring users to these compromised sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16094904468fc1---josimisutukakawekipabapum.pdf In PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be428c42183---detor.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/1438476548.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a55240c5b9a---xigepasoteresowini.pdfIn PDF document text
    • http://forspeed.cz/ckfinder/userfiles/files/65588539128.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607392eb32d6e---88983688404.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16087d983621be---17993231877.pdfIn PDF document text
    • http://mldinsaat.com/image/files/66248543869.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/furetexoxamejapofivogi.pdfIn PDF document text
    • http://trevorhannant.com/vebazofolapore.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160833c025fc03---bezegavapek.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/lj9kd3mf9iut0gvk62dst0v37u/rasevuzogu.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/62179210778.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608312b8ebc7c---terapolavonejir.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/dekawarodafuruzovagaveg.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/22427931506.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5eb3897c46---vawobozu.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/kulisimenububoxonas.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/pezelezixelexevujalaj.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160722e625a3da---80138492734.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/4bf30ffbd52b330c38c1b619b34440f3/tekevor.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/35015260788.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/db92439541b709542866feeff36e23eb/12519133505.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/febagijegekawur.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/bde02486ab83f3a4f8f0a78e3badcb19/givobegepaxategapob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=idalberto+chiavenato+introducao+a+teoria+geral+da+administracao+pdfPDF 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_off00023f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23F5B 19652 bytes
SHA-256: cf81d2097aede62037c4e5f2c420eaaa8e82dfb4d056e7829ee05c865763a0bc
font_01_sfnt_off00027292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27292 11324 bytes
SHA-256: cc297fcfd0de87b6dc4fa0cedada47030a78e5d897ca351273922088364f96c8
font_02_sfnt_off00028c95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28C95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1