Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c8cb557617814d9…

MALICIOUS

PDF

184.7 KB Created: 2021-06-26 07:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9869eb6ac4590ad38676806f9212008f SHA-1: 9c5d507a8ef413329c10d99cb2172340a36ba4ab SHA-256: 9c8cb557617814d99d083785769819bbe5f6b9b3cb092641c710677daae0a657
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URLs point to a common phishing or downloader pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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=federal+government+fiscal+year
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609372b7bd193---vasabemogubaluwaregami.pdf
    • http://inspirationforexcellence.com/clients/66491/File/96508988428.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/2hc984bb8euessuq1fi5cpriu6/6833253524.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160942ec03b193---58480353664.pdf
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/d76d9febd4049269bc39f253970b4983/74304882938.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16081f930296bf---55070106117.pdf
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/4e5b95ac8ea836262475cb251ef77d1a/xetuluvezadelafu.pdf
    • http://dzbnf.com/upload/file///gevoxufazumaro.pdf
    • https://airflow-skateboards.com/upload/file/xemasisimerumogedanakew.pdf
    • http://indel.sk/userfiles/file/lonewusujibeb.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/f58497897991040f0046f0d83418ee47/jurobasufuvutubeponab.pdf
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/603f0ef5c807910c7d09e75b4f061065/60151738581.pdf
    • http://profil-metall.de/content/uploads/file/xoxixejusorimewuwuz.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094db0006b50---69844063820.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608715f64393d---jaxixipoposowofuvateko.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a93d4e19fe2---tipoxejinebakumuvemijik.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/puqmn0eni520vtkrmqft0hh24h/90202340199.pdf
    • https://plasy.com/uploads/file/28487921626.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/gowenapumatedazez.pdf
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/5cb81917abab7c8624496cac68715e87/mufegerifekuvu.pdf
    • http://terezmisszio.eu/files/file/xagosodofulakojisukosod.pdf
    • http://digitalpolicycouncil.com/imagenes/file/35086020037.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_off0002757e.bin
881737416343524754268d6dcaa8b5e0abf803f6312f5829fd9df30e50cc0688
pdf-font-stream PDF embedded font (sfnt) at offset 0x2757E 10976 bytes
font_01_sfnt_off00028ec8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x28EC8 16792 bytes
font_02_sfnt_off0002a6da.bin
0e95fb34f2de24e831140684071d4f247d1ea541680d3b8b913ab81282e52136
pdf-font-stream PDF embedded font (sfnt) at offset 0x2A6DA 16988 bytes