Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc7181fd14c8686a…

MALICIOUS

PDF

88.5 KB Created: 2021-07-08 12:11:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 19d4843c38f1894964c1b04c70fc06b3 SHA-1: 93735bf0d8563c9cefec39d6a1cbf59d7825b224 SHA-256: fc7181fd14c8686a1c41d8bfb6b4e4ac6f23bad2b6a56188160df12428c55e88
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs pointing to compromised WordPress sites, acting as a link farm. The ML classifier strongly indicates maliciousness. The primary purpose appears to be directing users to potentially malicious or phishing content, leveraging SEO-optimized lures like 'roblox all clothes for free'. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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://irlanc.ru/uplcv?utm_term=roblox+all+clothes+for+free PDF link annotation
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e0e8b99255f---45315575181.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b419f3e1c---28532771411.pdfIn PDF document text
    • http://wohingltd.com/userfiles/71136656786.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b275a6b0149---24423425522.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/74429769158.pdfIn PDF document text
    • http://www.serenissimaservizi.com//files/zeveguvumakekivokitevares.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/89f9f2eb2f0f5b69b38d0a4b045cb814/8903173380.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/2b5a0c711e74cdf23f4d5d2b2db02341/67228799225.pdfIn PDF document text
    • https://123natura.com/stockages/files/kenegu.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160a461aee89bd---66194605062.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608319f198809---24817484937.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/ie2qsinfjs04uprihkb26g7b3f/26602029593.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/5fc98bd2b9ce72a0d1bf6dd75fc55b80/pilubifubamodubopu.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/8918206719.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4292f2d531458dd10347defb65f8abe5/kaxoteponorusimikukatewo.pdfIn PDF document text
    • https://talleresimad.com/images/subidas/files/4179535669.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c91290714---rewuzonis.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/2b5ee978c4d91f0489c53f38ca72fb78/99913134322.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/065bdcd042c5a4f3cfc4bdd9096c737e/kabexomasap.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906cf2e2d79---jetapoketenesagijawokelo.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/74a0e543b32bdf39ce80b692e1ca7fa4/ripanizuges.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a79be77b36---tiwepube.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab301d1250f---neferid.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/ragosunebatozevolazow.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_off0000f60f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60F 10524 bytes
SHA-256: 2b6517db0cab2e58cb7cabf920e359652ddca5538c7eab7ed803b11d1dd7a181
font_01_sfnt_off00010e42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E42 17608 bytes
SHA-256: 3d164c5725191bccdd7e957cddc38b1c023239d89b1e067eee7e3e2253b1150a
font_02_sfnt_off00013c2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1