Malicious PDF — malware analysis report

Static analysis result for SHA-256 39cc1319069e51d5…

MALICIOUS

PDF

94.0 KB Created: 2021-09-01 01:18:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3dfbe96fab93d491d687ed7dd239ce4b SHA-1: df9cd7fea78f1c36f5140fcffdb7da19bed3c07b SHA-256: 39cc1319069e51d51d1daeed8952505313c8dd06fa94c8660754b512f382ce6c
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier indicate malicious intent, likely for phishing or distributing further malware. The file's structure suggests it's designed to lure users into clicking links hosted on potentially untrustworthy domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8088

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://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/3dff23a836022d354c864b927fc2611b/87635513289.pdf In PDF document text
    • https://systematix.pl/userfiles/file/47619189789.pdfIn PDF document text
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080bb27dbb17---vagadutiredefokidixofija.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/02f1d452c4e3dbc2d1f72ad45f1790fa/kadezudagetalasi.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/2939834015.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/rufosuli.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/30541481611.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/16653320924.pdfIn PDF document text
    • http://yilip.net/userData/board/file/66765780471.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e1d7a6a5f---79102660939.pdfIn PDF document text
    • https://kopari.hu/files/file/xibogodufuw.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/1b243fec1769293d1fe8a4430f8cc489/41706034221.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/mitopibewebin.pdfIn PDF document text
    • http://mobilenmr.com/files/files/39164644617.pdfIn PDF document text
    • https://dvg.asia/ckfinder/uploadfiles/files/98108669122.pdfIn PDF document text
    • http://chanhbon.vn/media/ftp/file/korakuzasukavav.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819fba4aa1f---1418426591.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210605_215417.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/nidugatad.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/fepewajiz.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/18153099009.pdfIn PDF document text
    • http://boldogelet.hu/media/xabumumafuwelixenonuj.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/77525420796.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7ac65f198---maxetafuratuvug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=colour+starting+with+lPDF link annotation
    • 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_off00013235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13235 22456 bytes
SHA-256: a9c9b2aa82f0b617e96c59a9751b7a2d5b69e2d5488f88632584d8b625322a2a

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