Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c78bc7fd56e58d2…

MALICIOUS

PDF

84.1 KB Created: 2021-07-18 12:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 235f6f8a79fca2dd46d681e6c7623dc6 SHA-1: ca512b862d047e5c6e7bb03d4ff414149f8fb718 SHA-256: 8c78bc7fd56e58d2a61827160aa3e53c789f749c87f83c82a8fcfbf521bcb68e
104 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for delivering malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is a link farm pointing to potentially compromised hosting, suggesting an attempt to distribute further malicious files. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b481404dbf4---84328842255.pdf In PDF document text
    • http://garage-fuji.jp/js/upload/files/39137968850.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098fcbebfaa2---61050779635.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d3a3a9884---11950222580.pdfIn PDF document text
    • http://plncse.hu/php_data/file/wojanibamowo.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/3902860536.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/gizuzalawubewukorubudid.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/f4a7nltkrl0sbke7v4h12smc4e/desefaviw.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/90092691409.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3e8a011ba---96226753454.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609a80ebb93ee---bodepunanosas.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/kixerix.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/39734657885.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb9f5cb631---82547384734.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160987bf1d5bc8---47412568336.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/52277441905.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/xiwepipilinukomuxaw.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608179da3a840---marelotokabemepus.pdfIn PDF document text
    • http://fitviewer.biz/files/file/18066438872.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/21301918027.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/krin1o4vb96dioglaa5kadq1e6/43020783626.pdfIn PDF document text
    • http://lucann.com/Upload/file/gibefonuxukidoweboda.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2e84d78af5---lufomenepadijiwe.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c76b6d91d9---lujelusila.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705f870c58a---62352935152.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=define+transpiration+in+water+cyclePDF 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_off0000e60e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE25 10672 bytes
SHA-256: 627e07011e70f7f844bbffb0355e5954f1e640a9ee009d3768da8d78826818a9
font_02_sfnt_off000116d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D5 16852 bytes
SHA-256: 821e1f57d6b7236cbb1926ffb34dcf82298d8c928fed1f0a2c01901e66669e15

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