Malicious PDF — malware analysis report

Static analysis result for SHA-256 191550bf7d37b7dc…

MALICIOUS

PDF

89.1 KB Created: 2021-06-26 05:07:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e121e48eb638fe5db449b02ab119522c SHA-1: 616fa8d45ea205de73deedf29033744d64c560c7 SHA-256: 191550bf7d37b7dc375567e91494b6ecf86751a502200b5c0cef23c86a30efa5
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites. These links likely serve as lures for phishing attacks or to distribute further malware. No scripts were extracted, and the document body was unreadable, but the presence of multiple external URIs on compromised infrastructure strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://allytemp.ru/uplcv?utm_term=us+market+futures+today
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16091a7c9599c7---gajokuki.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/u4j4vfh43krdq7eatd8v1mf6v0/11687828837.pdf
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/degux.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882ced86f42---18346829606.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16086e34e47a39---vosefas.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/034380e9691082d21b91b59b3f165172/57935093968.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7363282b2---71328988260.pdf
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/21db141ee25693dc4a6a887fdfd3070e/vodupiweke.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1df2c49a0---jubifibazimolumaj.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b734ebb1551---68662083050.pdf
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/6vkvuvm1njq5ga0g62dqe85687/rakuxudimuzepufisiduwusil.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/58014bc80ec698016f04cc59c745435f/mozivifobolonogojom.pdf
    • https://weeb.nu/userfiles/file/fateweposuluvozurat.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/o35q2ghrglkrrro26c8c57l1fi/178199799.pdf
    • https://bestrecycledautoparts.net/images_i/file/jujawunov.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/9dbcbf8494475595757ed43388cabf5a/rejipaw.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d05f74cd9ed---nolaxagivika.pdf
    • https://privatecambodiatour.com/userfiles/file/vezikuluxofi.pdf
    • http://pnmanagementsolutions.in/uploads/riwunilanu.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2371d80906---vufutowanilu.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/9fe61d01d950ed98c76a7a235a6ba3f6/73911547755.pdf
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/642f94fb5a7c0ae1aa72104c8adec539/94644376811.pdf
    • https://widepolymers.com/userfiles/file/67221852601.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f772.bin
c30d3216eead00a293275cd0f409e5f02a323453eb2308235d0c97bb511d290a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF772 10584 bytes
font_01_sfnt_off00010fb5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB5 16792 bytes
font_02_sfnt_off000127c7.bin
0aabb305fc910cf65f4abc7f6db025f3db0e2b651db88c3ada256e89763e53f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127C7 18536 bytes

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