Malicious PDF — malware analysis report

Static analysis result for SHA-256 d898d8340b4e61fb…

MALICIOUS

PDF

112.0 KB Created: 2021-07-14 04:30:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: bb1ef8d9b98aa947f79e33f00f4fbc17 SHA-1: 578a3befa4a0f7a3630296f66b516e74b8fd3882 SHA-256: d898d8340b4e61fb22d2be7988f2aed5f39be95e21871c8d9b070f6fe222f1f4
94 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to other PDF files, many hosted on compromised CMS upload directories. This behavior is indicative of a link farm, likely used for SEO poisoning or to distribute further malicious content. The ML classifier also flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6820

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 http://botosani.ro/img/uploads/file/pakepuvisal.pdf In PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/u8nv6mh2ovu0o3c02cgq08cqvb/wamebarubi.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/28786313971.pdfIn PDF document text
    • http://scheidenschiedam.nl/uploads//file/46483722719.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/16990348309.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b19aa1cea---42552484859.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/46234105690.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608824b77972b---xiwavemubukoxiv.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/54027687413.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/95758456983.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/wufevefapivuxalugakikin.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/putavefutesatozaburor.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/fotowarukanorejigagidoso.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///35925092735.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b1eafca13c5---dipulananokaj.pdfIn PDF document text
    • http://bi-acaovo.com/upload/files/54837048680.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles//imagenes/83644981503.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/1dbebe14724544f46491e4ce4e9b03de/76120284368.pdfIn PDF document text
    • https://sanidom.pl/img/file/gejojosijidunumod.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/33700121316.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=coupling+reaction+of+anilinePDF link annotation

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