Malicious PDF — malware analysis report

Static analysis result for SHA-256 8013cebe2ac217e0…

MALICIOUS

PDF

80.0 KB Created: 2021-06-29 14:56:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c9c9691092645050acc558983aa8495c SHA-1: 5a8998c0b447a7aec2d3afcf1109fcbc3b5017be SHA-256: 8013cebe2ac217e0536acbc65ae384f65be675c9c7422a59cccc8466321ebd5c
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised WordPress sites, which in turn host further malicious PDFs. The ML classifier also flagged this PDF as malicious. The primary attack pattern involves directing users to malicious links hosted on compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6032

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://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b42f06b5083---vuduwuponepa.pdf In PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/c24c634c7b811c84e4c8209485dabdc5/rejokiloxovite.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4f1e178f0---48368838690.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/2438270f56416ee083dc781aab28ba4b/fojesebuxofav.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/jalijudirojumeku.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/7600bfc5c4a5cc9990bb6d397d5918b0/81297035213.pdfIn PDF document text
    • http://asahiru-ban.com/files/files/32869451385.pdfIn PDF document text
    • http://zzsz.hu/user/file/84526491456.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/metagerobirupujad.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769ac31c109---nevufojogape.pdfIn PDF document text
    • http://huron81reunion.com/clients/f/fe/feec28e48c841af8be4ad6373737a022/File/piritinolotejusapodi.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/h6pv72e9oj4s19ilb81sn0dv01/73559332956.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b92376726d---7694970903.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7accb13582---xezitoxosujaxorirakena.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/bokojibekebizovewila.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a474ef27c---dafipapukajaf.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92fd6b5548---zenorop.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b009a562f74---46863714882.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/texubudobugiwopozuvom.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/70720211306.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=metric+to+imperial+tonPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000136ab.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x136AB 3529 bytes
SHA-256: 89b32d9a216e340eead95a543c338b3ec65ca596378137534a3fd073777befb9
font_00_sfnt_off0000eef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF5 18560 bytes
SHA-256: 8caa2bc751b6261c233e312f00fb3da0412900ccf7d741edb1e023ae4c9c4467
font_01_sfnt_off00011e9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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