Malicious PDF — malware analysis report

Static analysis result for SHA-256 814d86ee2aadb3d9…

MALICIOUS

PDF

62.5 KB Created: 2021-09-04 11:34:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d851409da98d835d4529251926af069a SHA-1: e80a16426370941566119b061bb05b52873e8fbe SHA-256: 814d86ee2aadb3d9f0d1359aa676f0e033cc701685fabbe2873876b9c1c0318d
94 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, suggesting a link farm designed for redirection. The ML classifier also flagged this PDF as malicious. The primary goal appears to be directing users to external, potentially harmful content, rather than delivering a direct exploit within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7578

Heuristics 4

  • 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://prawobrzeze.info/userfiles/file/88728575942.pdf In PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/stk15e0i3mfskqt8hcmq9lkik7/93325023560.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/l36crduf27q8kqe5ofcigmdq15/63940185123.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16085fb0a21825---39488820362.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/6380e57050f879d7a937db3da13d1055/84083354299.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3833a6ce3f---53601613360.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/1930977641.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/36i82lk9lumq3ba4h279t50pc1/mefixezazago.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/folebij.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/91472021127.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5bfd7374a---nesojemewaban.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608841486865c---19073825189.pdfIn PDF document text
    • http://suapaiatuipelehakefamily.com/clients/80707/File/sirujevunimotibuxuvan.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/19491651393.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/34016313097.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/5bee003d4378ff155a0aab13aa5bc034/kuremekisoniloluzudipeb.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/f506afe8ea9e61c668318d2db92447f6/41329031746.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/p1odiqj0j1tcc820pihun1ue1s/kubofajuxeket.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/kokikukituro.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/51936074700.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=tamiya+trf420+manualPDF link annotation

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