Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2add981855a4c91…

MALICIOUS

PDF

86.8 KB Created: 2021-06-30 09:14:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 996d97ad742a2cad34dff1f0ca4657ce SHA-1: 4f5649a1020cf413b0ceca4713fef3bb667950f4 SHA-256: f2add981855a4c91a0982bbf0ecddba2fc6df27fbb67e00aff83e410c6f28d52
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://iberryhomemade.com/userfiles/files/40446602077.pdf
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/dbf9ef84caeaf2f96e530bd617afed25/nadivemoxas.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16093b0c926f5a---zomabupatiwowugofuwafeji.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc34e3d05b---laroduxusewitisi.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/mo14nthmu8v99jpbipgoclff5r/mematalatotodepuri.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a20242b37c7---70690617178.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c641850386d---zosabaluzaxepodejumax.pdf
    • http://bebelino.ru/userfiles/file/11000514295.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/67b6b11c6cf627f52c75c183cd82edae/jukifogebisi.pdf
    • http://fouladsazanco.com/Upload/file/nekomibonudina.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/8237622207986c850f3b66f86786700e/19915612701.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b296626b51---94861635328.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8e14b7f4b---mubugoripegolaw.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/b95e49353e833b3253c87b985849831c/75728597934.pdf
    • http://nuovojob.com/userfiles/files/filof.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c48ea8718---26105978217.pdf
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/8ff6aa367b4d0c1cea749b2de0ecd8d3/9938035565.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb31f256b5---pubefenam.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/flftu6p2l4lk5bkb674ccb5ip3/nejogekikiwigubofidute.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608946299313e---73165879126.pdf
    • http://hzkontejnery.cz/ckfinder/userfiles/files/18359286671.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b258649efd8---39461687892.pdf
    • http://reikihaus.com/clients/75291/File/jogufe.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8ee0ef986---bujunujodatobiw.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=ford+foundation+predoctoral+fellowship
    • 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_off0000ed79.bin
c61c86567dec9014aca9f47470aa5447a28b24fb403cf83f2b9e184133f7ca44		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED79 10880 bytes
font_01_sfnt_off00010698.bin
960ac882edfe78ee8c138100a42ee27768698e13aa344f256bc0fc09a5b26b11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10698 17308 bytes
font_02_sfnt_off00013430.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13430 16792 bytes

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