Malicious PDF — malware analysis report

Static analysis result for SHA-256 f57c5ac8b0d23838…

MALICIOUS

PDF

54.3 KB Created: 2021-05-09 10:29:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 9da217689cc1370d383346de1e1f4da3 SHA-1: 971f5700766dcbf0243756342cb2bb7136fb1d84 SHA-256: f57c5ac8b0d2383885454a91f34e6ee74254f487230610dbb30002a759c00ee9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites, specifically targeting WordPress upload directories, which are used to host other malicious PDF files. The ClamAV detection and ML classifier indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it's part of a larger malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7300

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://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608a790448dff---kanofukozeramizotigifari.pdf In PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608576e00c20e---kadesinukotemenitir.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/fec5696971af93c84c85b8f34b079fe4/76015274041.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085fcbe6822e---64554052915.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/m4nu7sj3598kh33f95lqljrl11/56002311750.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701023c6b00---zisotug.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/54907740532.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/86931739903.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/rir9kcmbb99o5utc1lqoj6u98o/nezoni.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/i0qriuou9hiafncfkvm0s234q7/76476596398.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/5bac031522a01a43966cc77eca589a5a/dulaza.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808f9e20efb---97758410029.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d494b34709---zefedagod.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/29814579945.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/6h08dahueg68vao6838bugj4ud/gajodilidimulilapopopab.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc77d2565a---37899714986.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=cours+d%2527+italien+d%25C3%25A9butant+pdfPDF link annotation

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