Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ea73f7be6fa4824…

MALICIOUS

PDF

69.2 KB Created: 2021-06-23 00:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d420ce56101d7737e7e6b7dcaa707b7b SHA-1: 656398d62dac92120358435cbe0ecd1aea5b79aa SHA-256: 0ea73f7be6fa4824d2331318f6c516b00ddea830b33c79b5d6bc1f213e312770
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised WordPress sites, specifically within form upload plugin directories, suggesting a phishing or malware distribution lure. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded links indicate an attempt to redirect users to malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6662

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c770bdba582---sunojirixomovuko.pdf In PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/babezotaxebof.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/3ff305128ab492ed3bd95af5afd962d4/81726580682.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f24bebdbba---vizazejujijemirukavujaz.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fded57cfc0---vokekinoludukumufiwiju.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082f15d35766---desesifebojunorepubuveva.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/d7f63e6dbc1219eaca5f52da8eabc73a/85770936578.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbf458b6d8---peror.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/21379858987.pdfIn PDF document text
    • https://bczenekar.hu/files/file/fesamogojev.pdfIn PDF document text
    • http://elitvorota.ru/f/file/tigidakuvo.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/govol.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/GLLx1DTH0VQ/uplcv?utm_term=upload+large+pdfPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB75 5020 bytes
SHA-256: fed3defac7c0c2f17c3ae170b62dc207762f88a9a4b62951de9e21d34afbec63
font_01_sfnt_off0000ec9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9C 11808 bytes
SHA-256: a518a8727dc60e0013d7c968c013f07ac65eed4f954bcf82f6f2e1ab015984d9

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