Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff91c37c19f24ab9…

MALICIOUS

PDF

58.6 KB Created: 2021-03-11 00:37:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 6f9e6462f455f3cd2948d27b23ac8b4a SHA-1: 6b95726b46e4dc3d4cd4e01b8aa4c1cf015ed4b8 SHA-256: ff91c37c19f24ab9eb6650a48fbea6cc38d19a1b7464a9c6831553bf578571ab
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by multiple heuristics and an ML classifier, including a critical detection for a link farm on disposable hosting. The embedded URL 'https://midufefew.ru/award?keyword=buskers+songbook+pdf' suggests a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, further supporting the link farm hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9772

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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
  • 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://midufefew.ru/award?keyword=buskers+songbook+pdf PDF link annotation
    • https://babixedijifaz.weebly.com/uploads/1/3/5/3/135385025/7721182.pdfIn PDF document text
    • http://zimipamus.22web.org/13012890480.pdfIn PDF document text
    • http://8bitbeardsco.com/54384335991se4ol.pdfIn PDF document text
    • https://xejigidusulup.weebly.com/uploads/1/3/4/7/134730122/wezin_dajewelorobi_lagana.pdfIn PDF document text
    • https://rupebadik.weebly.com/uploads/1/3/4/4/134465272/waxifatenirik.pdfIn PDF document text
    • https://lumosezuto.weebly.com/uploads/1/3/4/4/134499790/6264182.pdfIn PDF document text
    • http://intekzafast.online/is_grandma_got_run_over_by_a_reindeer_on_disney_plusk5js3.pdfIn PDF document text
    • http://milansit.space/surotapunokelojipo3nddz.pdfIn PDF document text
    • http://reduslimitalia.website/andy_robertson_audiobook0smaq.pdfIn PDF document text
    • https://87da31d5-d184-45e7-a456-0ad082c8bd65.filesusr.com/ugd/55e94a_d4348a82521042e9b961229d2f46486a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/caa1bd8e-a2ad-4017-9ddf-8078c08d54fd/cuantos_centimetros_tiene_un_pie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/301045e0-cd22-4d87-8fe3-48cb40fbabc6/is_vizio_model_e320-b2_a_smart_tv.pdfIn PDF document text
    • https://eb62986f-0112-409a-9ebe-777412bc5c19.filesusr.com/ugd/26938b_d5cd29a798924001ae4342452f0d57de.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d044ca8-e32b-4a0b-ad81-a55be1fec072/matlab_function_without_output_and_input.pdfIn PDF document text
    • https://cd5f93c7-0ca3-44d6-bd9c-c1129931b1ca.filesusr.com/ugd/bf07b1_1c5013e2150240e9bee07e7f40100f2b.pdf?index=trueIn PDF document text
    • https://3745348a-78a0-42d7-8ff4-af2b45bf5faf.filesusr.com/ugd/02631b_6fba3bb54a2549fa83e787e96320b5f4.pdf?index=trueIn PDF document text
    • http://potefedezazox.rf.gd/videwa.pdfIn PDF document text
    • https://711920be-b761-4f0e-a604-762b26663b16.filesusr.com/ugd/ffcbea_4249650599f14926a24e3d042e65fddc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2ad61be-a7a9-455e-b078-bcff982f86d5/convertir_centimetros_a_pulgadas_cuadradas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c29c2b53-c611-46f7-9ca1-d4690cb6ef4e/xowusetujuvavojufon.pdfIn PDF document text

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