Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddcba74df8ede514…

MALICIOUS

PDF

90.3 KB Created: 2021-08-08 18:40:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 586adc25e91a025ae73ac648a72a730b SHA-1: 9252ef43b66c787be6ebf77308bb7193ca5adb43 SHA-256: ddcba74df8ede51405bcf063b1abaef7e59d930e8b22ae29b9e9007c8ebb6cae
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern observed is the use of a link farm, likely to manipulate search engine results or redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://archism.ru/uplcv?utm_term=free+california+dmv+permit+practice+test+in+spanish PDF link annotation
    • http://schodylux.pl/userfiles/file/puzemuriguz.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/zofesojazefedudije.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/oqhjca7arji376ita80bclfmj8/53786064970.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e285a0ca05f---ratukazegupudajagudoguf.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/kogagilokago.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/tazesafumagiloripubewu.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/luvubasinidipadevudujavaz.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/af08c1ac69a365d30846d44ec50566a3/rejanuwaxi.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16077416e0d61f---zurokumokolezegipokume.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/1v628ib08gqhg3jc7ft2kin6ef/mogafejobaloragewagugup.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/3d4d4df146e34ebf0016fcf6e3594d6d/nikumutujazeziwix.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/bf2c58047191568b7acf9641bdb7217b/wikimivizamadukiv.pdfIn PDF document text
    • http://underbutter.cz/download/foto/siwabalokevalid.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/lututalafizofowubono.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccfd9ca8ad---janadikosumikizufuluja.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/23542337681.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16087c44fd9699---wekifo.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16078b072b0a9c---33746862489.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160980d4f1cdce---koweridirida.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/99413744540.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/11425938082.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/jpdmfdnbbr2q4j39a2rs63kgg7/retejezunonevegunizinegal.pdfIn PDF document text
    • https://nadamasristorante.it/file/12320209700.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c5ef93b3b---20768162640.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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
font_00_sfnt_off0000fa16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11228 17452 bytes
SHA-256: 19f44f8fd25a90d0d85ccd312bb02610e48cadf2dd71dcd6d54e474ea625221f
font_02_sfnt_off00013fd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FD8 10928 bytes
SHA-256: 0de108c3d7d073bae8ecd38e75fea166b910ed0774258632a2cfc7f3df7c5a0d