Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0cc4b529def46f1…

MALICIOUS

PDF

101.5 KB Created: 2021-06-23 04:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f50e9a1baea0a5ea2f270773383fd453 SHA-1: 17398de15081b3446163416063158e7d31f0a4fa SHA-256: c0cc4b529def46f17833f25575086461e387d8c29621da525a483c34c7c64ad9
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to various websites, many of which appear to be compromised or disposable hosting. The primary purpose seems to be directing users to potentially harmful content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8269

Heuristics 5

  • 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
  • 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://chcial.ru/uplcv?utm_term=the+story+of+my+experiments+with+truth+questions+and+answers PDF link annotation
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/79da02895ca3fa6245a3ebcb35575011/nifisetuvijetogipizeni.pdfIn PDF document text
    • https://toromecanicorodeo.com/files/toduredimidobulu.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/9c6efc3970d5ba15b78bedce77f001e0/dadaxigibekemerobi.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/f85e819a86c6299bd2c6962d365b4d67/ziditaw.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd6260220e---valavomegupa.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/vafime.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160985a00145ac---bukalipuvexufiwemumaxasa.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/r6fc9oedlg9o8jnosd0momr4jc/nevudizowizeruzuroxo.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/59529846857.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/sokemoxatutowuwenuzukinan.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a727269a53---87533933617.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/ef6022bc2092ff7fe68584d0195c11e1/67336964945.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/nikojivavez.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/duxiwoxejip.pdfIn PDF document text
    • http://zigzagontwerp.nl/sites/default/files/file/nofelodebedegi.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160703c25532a3---memozoluzukuw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.indictrans.orgIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000159a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159A3 5588 bytes
SHA-256: a884f5b6d6e52863caa39f272e3e470e4e81ff95ce19b10ce62bae4c09ff549d
font_01_sfnt_off00016c87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C87 5236 bytes
SHA-256: f21b05a2340b363a1ed8b0bbfc234bf9da5e90c1c639b98be765a2f280f9ba06

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