Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff343a63a60e733c…

MALICIOUS

PDF

58.1 KB Created: 2021-09-08 02:45:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d57be53f0c598af5cb1a9ffb3c3d86a6 SHA-1: 83450ce85000a171fd74c591555e7f95d83a0d2c SHA-256: ff343a63a60e733cb5507b88432b6d56c19bf2318f5ba5535a963786e1cc97ea
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to compromised WordPress upload storage and other disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier flagging strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the structure and embedded links are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6836

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://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b119a203a7a---51414601405.pdf In PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/99192412863.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/kakewepejaxeladob.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/fuzerulug.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/70394285231.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b53a47b54c3---90921058649.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090586aa1de9---wakadovinev.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/87420345979.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/514e3ce97866ee715fd151b6d2726a11/18455901121.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c73bc8049d3---jibisowezogodewora.pdfIn PDF document text
    • https://promise-land.com/upload/file/varuvuz.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/58923364258.pdfIn PDF document text
    • http://helloshoppingnepal.com/userfiles/file/16644638224.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/ripotijero.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16135a63e34b6a---32724239315.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/wesabamonevifere.pdfIn PDF document text
    • http://juha.be/_files/file/67015083892.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/kigewaxobumujizurowexuba.pdfIn PDF document text
    • http://lianbang123.com/uploads//files/202108111950514752.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/14530198865.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ireta.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/67333525641.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=2015+mercedes+cls+400+manualPDF link annotation

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