Malicious PDF — malware analysis report

Static analysis result for SHA-256 c08879ffa3e13d24…

MALICIOUS

PDF

55.4 KB Created: 2021-09-06 19:08:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 888c8352c7032b26a6b3b4f7ed033fae SHA-1: 287d0df36231492a8730996c11f4518aa7b0361b SHA-256: c08879ffa3e13d240d66d7d6569336eae8a1df8a7639c032cb3200809da9d2d3
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, likely to redirect users to malicious content or further stages of an attack. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7352

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
  • 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://crysiq.ru/uplcv?utm_term=viper+car+alarm+manual+transmission PDF link annotation
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/ih1qulr0jmek1jjq17gthejta1/40323510589.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/xanugumulotidu.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610671d81d854---sorozebe.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/vasex.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d91441bf02---dajiniz.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/9536919528.pdfIn PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/22730108593.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e03654538d---diwetezebaxamo.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/14582902132.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/siworenikudikow.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/zimaw.pdfIn PDF document text
    • https://razredna-nastava.net/files/tamosu.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/79a820b6ecd852a3dcb8108a2ab3a65c/8859727942.pdfIn PDF document text
    • http://euro-ex.net/images/blog/file/36666983100.pdfIn PDF document text
    • http://guowangcable.com/d/files/55825974321.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b67e00068---35812305036.pdfIn PDF document text
    • https://frontivo.ro/userfiles/file/33356732979.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/govifegujuvurameged.pdfIn PDF document text
    • https://dalba.net/other_files/File/kujapopovupiwijemenikapor.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f27989f36---tizimebinu.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804dbf5926b---70330839094.pdfIn PDF document text

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