Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c05aced8a5b7f87…

MALICIOUS

PDF

101.6 KB Created: 2021-09-02 12:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3ef4ac2af1e4115612d6065fe343cfb4 SHA-1: 0790e3c38b304382fe7a41a05c58223c92d9a8ce SHA-256: 9c05aced8a5b7f870683fcceda71515f0e377455c3768b1f2369dee6bacaec24
64 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. The primary purpose appears to be SEO manipulation or directing users to potentially malicious content through these compromised hosts. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier clean score 0.2108

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://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/68763857aaba5207c5cff35d90cb33ff/gusagefatovijup.pdf In PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd270ec8f39---movifasuf.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/24383a78e35fe3d58616de7a24d67df0/tokutazaxok.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/gigiza.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/434d90d6drh7nh6oklp39cni16/64485310569.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/jimopetoludeviro.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/d50a697243700e9b43ae255c31a7082c/fepigakenasizifebenedovik.pdfIn PDF document text
    • http://thesetnews.com/images/fckeditor/file/guwufedi.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16077a3bbbd77d---fepugiku.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed3fdaef6c.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076309dbe779---22073130229.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7820c7b42---nasiminowupiwe.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/76683531863.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/37570327786.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/foxusisam.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/3626655569.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/xedepepatob.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e4dab11fca3---40517818136.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e131a8d1ec9---57382212119.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/posogofefivad.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/3451261262.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/53594556689.pdfIn PDF document text
    • https://congnghiepxd204.vn/upload/files/32804880400.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=teaching+manual+std+3+english+unit+3PDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000142c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142C7 20732 bytes
SHA-256: 34b5168be68c057d15fd7266df0f20da34013513388a493c078947a66a4baf5c
font_01_sfnt_off0001796a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1796A 10832 bytes
SHA-256: 7439ec2c4758fb02928542a80cb30275696d70c797280ea8ea942897214c2650

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