Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f02154bbcb4912e…

MALICIOUS

PDF

80.6 KB Created: 2021-05-01 09:45:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: fd58fc874a425796e2f7047e35de9ff8 SHA-1: e7591f91a840b6f1b7c5a9f59c29db954297ccbc SHA-256: 9f02154bbcb4912e63d0d7ffff026bc79d5a07e49368cdef86b874afa10230bb
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a tactic to distribute or obscure malicious content. The ML classifier strongly flagged this PDF as malicious, supporting its role in a potential attack chain. While no scripts were extracted, the structure and URL targets suggest it's designed to lure users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/c6aod671hcecc9u693isvp55ou/81558349545.pdf In PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16071c5488e380---pebovepan.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160840f1c4dc1b---87268950921.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1608a037dd8704---vedalezinevu.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/8dfaa8be0a0564496c8b165b51cfef57/70581672229.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/7g9nt638me13hc816dlrdjg1r7/60266827469.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848d8ece43c---jajefedawikawisinaritat.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/da8c590d673329d88ecfac8282063370/kerat.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/6s7jbbftn7nd0uss8m8k23djl6/sufarafituruta.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/ba4156ce73379751cd17d809cc3713c4/jozesaxeto.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/11910777910.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/a1ce8abfe1d0e5715f73ba00502788c5/59582906699.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074600de5ba4---95207340278.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0f776db40---jaxezisowebakeveme.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160835dcf433d7---46016190318.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/31181471900.pdfIn PDF document text
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/6b895acbece54c05c25b4e36d77b02f6/95562051112.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=educational+themes+for+powerpoint+presentation+freePDF link annotation
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8A 5444 bytes
SHA-256: a9ed81f890e48f45cff8a3cb2874785135b4d8c7f8072bd925dd0e28cca69926
font_01_sfnt_off00010ef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF8 11400 bytes
SHA-256: 3fbed993351cd9249e2befba473c40a9a6b2ac0398009607ad82a0b75a524625