Malicious PDF — malware analysis report

Static analysis result for SHA-256 6df5d4e33a9631c2…

MALICIOUS

PDF

84.7 KB Created: 2021-09-07 18:10:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: df094599c335dd65e2088a62d248f089 SHA-1: c6c30dfb83c95cb13b3ba61b6c00cd2d36fdceef SHA-256: 6df5d4e33a9631c2ae00f168a4d6fc1c36419eb7a339c021736b6a94fc190c07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host or redirect to malicious content. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs further support a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • 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://40parables.com/wp-content/plugins/super-forms/uploads/php/files/59c9658b5bab710a79c332a77427c7ad/66609890617.pdf In PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612e75ceedb23---julaviwutimaredorawawox.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/65226516851.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/1dc1a0e177f67392bb30fba1f6f11de8/gamobiwifojiwokorul.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/c4e33cd34e1968c54e4e7281579b0a5e/38482461127.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/5009164752.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/gikilewafewojaruseve.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c8422b080---19040307087.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/bojav.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a59f3c22391---4088172201.pdfIn PDF document text
    • https://longhoang.vn/upload/files/zuluk.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/c9678d65547700c46e20eba2408c4384/59726572582.pdfIn PDF document text
    • http://minutemen-jrotc.com/clients/84940/File/gesudobexuxopilu.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b85eba5e906---68745345357.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/10061803461.pdfIn PDF document text
    • http://gloexdr.com/wp-content/plugins/super-forms/uploads/php/files/6ff4c47e093e56eef2b48dc93bd6d150/zeweze.pdfIn PDF document text
    • http://teaandtiarasottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/87323090636.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/53976980704.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16087b08bf2194---71658779240.pdfIn PDF document text
    • http://sklenicky-obchod.cz/web/admin/fckeditor/userfiles/file/topizudosoxelabujupav.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d00438230---92477992940.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/3b823e2d43af9e6b65fb9601d310e33b/69832235205.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/mituj9ogfagap4snntcr4mjkg2/54345137569.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=site+analysis+pdf+bookPDF 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://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_off0000e44f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44F 18256 bytes
SHA-256: 79f133f3bc0f9494b31fb3de5b967795a50ca1ad6803404d1267802eec932a57
font_01_sfnt_off00011440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11440 10812 bytes
SHA-256: 7dc57816c81c956d7108738a2ce24d44c82ceba63816ebd78745c7b70faf9978
font_02_sfnt_off00012d13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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