Malicious PDF — malware analysis report

Static analysis result for SHA-256 d54d3fe8dd9f3fe6…

MALICIOUS

PDF

76.4 KB Created: 2021-07-07 12:14:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 980681808bd6357efb6efdf9275bafb3 SHA-1: 2ac919f536b5fd0f142622f4acddc0dcd310c099 SHA-256: d54d3fe8dd9f3fe6e565a7f610b60f4267a7fb3b17ba44757be846e0a155e94b
96 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised CMS upload directories and disposable hosting domains. The ML classifier strongly indicates maliciousness, and the heuristics suggest the document is designed to redirect users to potentially harmful content. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://hytechplus.com/userfiles/file/lorinomosiramifawi.pdf In PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/d6efcb4df125d66ce328eb58113cae95/21410609852.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/97064543265.pdfIn PDF document text
    • http://haki.vn/uploads/files/jesarokimuzomori.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/zewusafepofumunevexu.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/ign1f6r9p1escoadu9o49ujen2/pibadamegisanimasuzaxex.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1609289d5db549---88719869255.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/46609983737.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/18160399367.pdfIn PDF document text
    • http://sonkertrail.org/clients/9/92/9260a3c387aed4615f72c72c3a1da295/File/98480356434.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/kowuxilarukepoda.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfbfa833028---48742473278.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/q2ajn0jpk3a1m7k7q5tni0ut5a/lewimivetavap.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/84458542194.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=just+like+a+day+that+i+met+youPDF 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_off0000c8cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E3 10608 bytes
SHA-256: f1521a6d9a9d50fe584ce7d0d0a763cbc2c125181818c231c6f2a259f4c3e9c3
font_02_sfnt_off0000f931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF931 16728 bytes
SHA-256: 4c07fd378838b605dc87d6940f09a5312c71320c2d4bcea29ff076b1d6c7c3b7

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