Malicious PDF — malware analysis report

Static analysis result for SHA-256 b65e2e72d71fe793…

MALICIOUS

PDF

39.7 KB Created: 2021-07-13 16:12:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 1d55ec874b49e0216837329521ac5b6c SHA-1: 9a392e22ce811c8ec4b8b7a582065911875ffeac SHA-256: b65e2e72d71fe793e2e36a5fc22df901d7296ad657243c1a6ccb4d50b88c4f6a
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF is designed as a lure, presenting itself as an image to trick users into clicking a link. This link leads to a compromised WordPress site that hosts further malicious PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8821

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 39 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0f0840574967e71e659d5a5760b211d5/43335484411.pdf In PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbab923cb96---50115263364.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/84911954334.pdfIn PDF document text
    • http://metall-press.ru/files/73033957374.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/fmtc1jbc5j9ljq44kk69n3ao2g/vefudozobo.pdfIn PDF document text
    • http://biosite.ru/images/news/file/33596631497.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210618_F9AA0778BDB41D15.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/85611003011.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/4gclv72cep1rlgfbtup4oacgoj/78992029174.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfdd11ce687---wunegaxarutin.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/xosegojasugodidugonad.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/ef561e530ebb9d522b3386ed5b38078d/torezajaleron.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da99e6c03e---2830769880.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/11558005350.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/94661511287.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c3f132a05e9---91657264484.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba49edbf35---musonifenofukezomojop.pdfIn PDF document text
    • https://finatwork.com/userfiles/file/boxilafizegewoxisokukixiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=papules+on+chinPDF link annotation

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