Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf45c36ce2c62b64…

MALICIOUS

PDF

90.0 KB Created: 2021-09-03 20:37:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 176548eced02b8e1900bb540e5c6d4bc SHA-1: 568a5e775cf60047a7e3e4ef7dfbc5d65c348ef9 SHA-256: cf45c36ce2c62b6469ea06c8b33e5dc864c3a62af7c24da72588f74aefb92d89
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs pointing to potentially compromised websites or disposable hosting, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the presence of many external links is a strong indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://bkdesign.ee/userfiles/file/94194810.pdf In PDF document text
    • https://abugfreemind.com/userfiles/file/54938972643.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/zotogodovawolotejupegu.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d085f4d1e4---84358596021.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffc550d125---dekimabuxibiti.pdfIn PDF document text
    • http://opgzvh.hr/upload/file/29301319385.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/0c8083b872b3c945a9ebe6958b69f3a8/satobalezukotinivo.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d214b00f6c5---70909766385.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/fujekosadebujakimov.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b08347e7b---nozoxuxeditomaw.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/6jp7h330cdv1et7apjr4cs8s31/58363235646.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f019ddb6ee---35592251685.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/zudedixi.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/notolibebokowowosazop.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/45388844820.pdfIn PDF document text
    • http://dzbnf.com/upload/file///vifolus.pdfIn PDF document text
    • http://dbexpertise.fr/catalogue_dynamique/file/mujikatilarelemedavida.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/vatujawi.pdfIn PDF document text
    • http://salt17.com/userfiles/files/povesix.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/e7528bdd2d66631e5b6f5e06d930d8b0/6234937120.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/fotowarukanorejigagidoso.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/52202907254.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=french+language+dictionary+pdf+free+downloadPDF 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_off0000f8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C9 18476 bytes
SHA-256: 6bc28a259603f852a22375a07f3210ee42eb1a498dd9534bfd4917371070af8b
font_01_sfnt_off000128eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128EB 11008 bytes
SHA-256: eb2548928a6e8978e23e3faa16bdf108f7f36c244472ba69837c083f4f7a6745
font_02_sfnt_off0001423f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1423F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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