Malicious PDF — malware analysis report

Static analysis result for SHA-256 40c2a97684d68269…

MALICIOUS

PDF

104.1 KB Created: 2021-07-18 22:34:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ce3cb621bcfc792d673c4fedb3ed2e61 SHA-1: 385e1fbfb71e2dce59610ff86cc3252f6f00d154 SHA-256: 40c2a97684d6826903e51e22ec8230562ec2be019fdb7490b716fd111b371474
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external URLs, many of which are hosted on compromised CMS uploads or disposable domains. The ML classifier strongly indicated maliciousness, and the structure suggests an attempt to lure users to potentially harmful content or exploit vulnerabilities through these links. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • 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 http://www.ferm-matic.fr/upload/file/kagaso.pdf In PDF document text
    • https://mszukam.pl/dat//file/35508455366.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/e790b0936ff6406108da3f179711d009/17318850548.pdfIn PDF document text
    • http://m2m2design.com/userfiles/xijemepajel.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/76331014858.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/gvdjpqd9gebku3ftcnh1nf50gc/fuborebobetipelalex.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2214623db3---xulimabutisaxomalazotaki.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c055c2208a5---xamibugekajoxizo.pdfIn PDF document text
    • http://lucann.com/Upload/file/13797206315.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/64645155367.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608402b41b3cf---xotojinafumavil.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16079679425f9a---42017865477.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a99a6ed2c3d---13031970921.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/38416280714.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/tepuxozoxudarib.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/bbab830e5de1f00d1dbc1154ec752017/59910368739.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/ba5a21491aeb605b715d08f40953e83c/wuripesegom.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/vn7ov550afgj6ssm3hm7m40kra/fuzakatapamipojuboxu.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/912f75d4470ce605d754e7240597e83e/48798664383.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b51233aec11---79722311466.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/xosagigiporid.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/37491094625.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/9976f2fc26627b6e4b2bd563de2e8829/firiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=musical+term+for+call+and+responsePDF 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_off00013253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13253 18880 bytes
SHA-256: 2e6e4d7e1736a6161333ff094d03044fd8f97a5cb7de9bf593a750b3dfc2d64f
font_01_sfnt_off00016342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16342 10876 bytes
SHA-256: c5faf02161c5ad09cfd4504fb47844682b714f3da1a47141fadac3cbd9cdb6c9
font_02_sfnt_off00017c61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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