Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3da1f65c252fdca…

MALICIOUS

PDF

89.0 KB Created: 2021-05-28 13:15:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 90ca71b294bd11289f3d9c83ab7d9c48 SHA-1: 717fa532dd9acbd6c6c154b1c4999262ffc7c598 SHA-256: b3da1f65c252fdcae2bf750556841c70cc3b986f4bf240c0acf117ddc199b4e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to exploit user trust by masquerading as a legitimate document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pixomot.ru/uplcv?utm_term=volumetria+de+neutraliza%25C3%25A7%25C3%25A3o+exerc%25C3%25ADcios+resolvidos+pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5f3796056---potoxik.pdf
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/7863280ab416f18933944a8e972e75a2/92993390040.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16075863dc6d33---vafaveved.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16071c7eb61fdb---20042060613.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/09qs1s337f7tuth2r7diefqtla/xugokabivilupurerixa.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081713f0c9ad---zewawen.pdf
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/14711cbe6db2d000a6f2736a3bbd68bb/jonolugedup.pdf
    • http://skolicka.eu/foto/images/file/90057652757.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/f9qnvmg6rmgaedt7ql24hqmn3q/givofufegeratened.pdf
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/fe94651e8f56ac28d7ae4cd7ccae237e/79227070917.pdf
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/a2c47bad48bbe73d15be6133d12316a2/32470859623.pdf
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/18259970346.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/c2t4g6v73hk9bb5r1molfrmtp3/jojedimujukizusuno.pdf
    • http://a-kamen.com/userfiles/file/tanosobuze.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001081d.bin
39e56910dfc593d0c2325dc5269595f47dd7cf8500edcc8ca32fe4d0bf62a3ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1081D 5880 bytes
font_01_sfnt_off00011b4a.bin
dc842607ae0aa95071055b968a9f8312645bf82bfc871f4afe7d0d397a4bc83d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4A 13848 bytes
font_02_sfnt_off000145e4.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x145E4 4324 bytes

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