Malicious PDF — malware analysis report

Static analysis result for SHA-256 452f39ea2add21aa…

MALICIOUS

PDF

80.9 KB Created: 2021-09-09 18:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4826414bbcb6f9e62d73044aae67775d SHA-1: 40a9add65d028e27b49892c55767318a61040671 SHA-256: 452f39ea2add21aa2abd1db6dc0b5c955c89c99afb8c275c7a5af1df10ccad21
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links designed to appear legitimate but lead to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is used to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://krisoc.ru/uplcv?utm_term=tm+internet+settings PDF link annotation
    • https://zoldlaptop.hu/ckfinder/userfiles/files/peximupoxamuwawepapete.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/81892876240.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/vukaxebiwigoxoleb.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/37505716097.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/97021529800.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/80482555032.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/67865610763.pdfIn PDF document text
    • http://manu-transport.com/documents/file/49170918224.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/8601389126.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/tobegagobituriwifowi.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fd96533eb---20000238159.pdfIn PDF document text
    • http://portableandcool.com/files/files/bufosinegomip.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/38074864734.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/15956097994.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/dilozalupipariwu.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/33600163447.pdfIn PDF document text
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/5120820353.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/93274677096.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134f1a2a336d---retarubotizudixosebezav.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/rotugorigawozem.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/7d037dec0a6cffac3b55f0935eba8a5a/fewitixalodi.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613912439ec56---fegotusupijul.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210903120233_gdgvm8.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/4da16d5ba0696c4aa1456c3fee844017/11378928088.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/47774406469.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612f392991f76---kuzojilalubato.pdfIn PDF document text
    • 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_off0000dc04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC04 16900 bytes
SHA-256: 1989eb17f3a43d663579aaa16038444eb6519f245e7b56c899d2cce7587c9f08
font_01_sfnt_off000107a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A5 10084 bytes
SHA-256: f62a1d734eb980bc2ae6dea50a2906392d79a158399aa58f4df88a4e43f01dde
font_02_sfnt_off00011e0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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