Malicious PDF — malware analysis report

Static analysis result for SHA-256 43433b220bd3ce79…

MALICIOUS

PDF

41.5 KB Created: 2021-09-26 03:47:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 25b75185c77ea28b7c6d225a7833abe3 SHA-1: c59ca0b19ea23137c16a1f892fc8d5d3fa805166 SHA-256: 43433b220bd3ce79a3b7e363b9c52d126fdb1cf770dc79e7bf21255f6d9f4323
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8388

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 http://pc-driver.ru/userfiles/files/gaxebi.pdf In PDF document text
    • https://inprovitbolivia.com/ckfinder/userfiles/files/zilarinojuwetuf.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/58065781234.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/694109190.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/podovijavazuwet.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/161475dcc53f13---54077587524.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/63136004957.pdfIn PDF document text
    • https://masihpt1.com/contents/files/metoresupotopom.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/mc2d049nssmkn7d5loinibk5fs/kumavikivujufilajazabixix.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1614fa5fa0fbd9---tonerer.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613f01dfdf6d7---xerosiwowosarumebovul.pdfIn PDF document text
    • http://vikingpaint.com/user_file/file/75142712111.pdfIn PDF document text
    • http://becucci.it/userfiles/files/xudafifafiwebemewoxis.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/muduni.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc3627adaa---42128006479.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-24/20210924095745103497.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/furidobenodenosebud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=racing+fever+moto+an1PDF link annotation

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