Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c5560ce2e1a6fd9…

MALICIOUS

PDF

91.7 KB Created: 2021-08-16 21:05:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3d8f1c5072c601fb0e08ec2a49f2252b SHA-1: 1a40fb90a4d9d4e63c7184a755fbde565d542e9a SHA-256: 5c5560ce2e1a6fd93768e47c1cb31d059c0fea7126a536d392e404db76e36fe3
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/201f1796ad22b84294b1bcf081437237/94281609297.pdf In PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160eff77651fcb---gekibavi.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/62143469617.pdfIn PDF document text
    • https://altbuket.ru/files/79918555803.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/1726796371.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/a1478270ad85f8037d932947b6e98ea4/xususilolenu.pdfIn PDF document text
    • http://www.first-classlogistics.com/image/upload/File/lovetusugepigute.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/beveferaji.pdfIn PDF document text
    • http://cppzone.ru/users//blogs/file/zusidugogunumufonimax.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160f874e1f393d---40852696717.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f284854d4bd---wapadut.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/90680512771.pdfIn PDF document text
    • http://pettwayfamilyreunion.com/clients/39389/File/90637805691.pdfIn PDF document text
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/51503258164.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/20650782345.pdfIn PDF document text
    • https://advik.net/userfiles/file/90577066928.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/7852321241.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/77fa0b92ef6c88926da0e551a76f2599/28672861580.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/30811341644.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/683ad6950774133a288daec900f01cec/91743850485.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/8b02508ed1db899d12da8ca352eda61c/lozewisanu.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/14410853011.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/xadizodimulaba.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6e160454a---rutabu.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5605bd605---63076237884.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/40342788472.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=all+i+want+for+christmas+is+you+piano+sheet+music+free+pdfPDF 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_off00010137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10137 16744 bytes
SHA-256: 7aec5ed35d552a08e8061968b4bb7d920699e54e167e2547625b4d36087f15f3
font_01_sfnt_off00012ce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE4 11164 bytes
SHA-256: e4b9582e894e1dc0f04d3e2ced565a8885f761c403c7366ffd0c498a636acc7b
font_02_sfnt_off000146ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1