Malicious PDF — malware analysis report

Static analysis result for SHA-256 2022b5a44f834bfb…

MALICIOUS

PDF

58.1 KB Created: 2021-09-23 03:22:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: eb305c145a1d08ca38eb5850c97e2ad6 SHA-1: b7013f9f79cdfbf7579dcf943772670384a9a6c5 SHA-256: 2022b5a44f834bfbebd16a4c529776bc3a7d1facc1036ad3639f24833e93a2a6
154 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised or disposable domains. The presence of compromised CMS upload links suggests an attempt to host malicious content or redirect users to phishing sites. The PDF's structure and the nature of the URLs strongly suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7775

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://philabc.ru/uplcv?utm_term=best+smartphone+ui+2021 PDF link annotation
    • http://moestuinwebshop.nl/userfiles/file/wasirikup.pdfIn PDF document text
    • http://tlumacz-francuskiego.pl/userfiles/file/lobesag.pdfIn PDF document text
    • http://hopkim.vn/upload/files/fowezegowavatoxofepibop.pdfIn PDF document text
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/71749883061.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/5459743291.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/49560935224.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021982229208617.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/g12edam95r8edq2cfjflt4v7sm/16733808387.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/43e4ae4f9b75336aa1989cfa86d9e8c0/komosove.pdfIn PDF document text
    • https://icbacademy.com/upload/files/9934420403.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1ff1a98f6---15935380214.pdfIn PDF document text
    • https://pima-alarms.eu/slicice/file/89871749220.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/1876235918.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/pelepe.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/xedaxuselu.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/3ttd8oj5ro0dsp9602lb7u3a4u/55398621827.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/63826973326.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/17380105223.pdfIn PDF document text
    • http://gaudi.tw/upload/files/7221561918.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/wotir.pdfIn PDF document text
    • http://reylab.com/userfiles/file/gikar.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/vufugixozefow.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A5 10920 bytes
SHA-256: 4bc8bd41bc22d1eb01b7a17e648e5bfc14461d31c0bcfb4a01b3b340c593cb9e

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