Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9871d1a04b37f27…

MALICIOUS

PDF

70.5 KB Created: 2021-10-03 00:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ef3ee8669a57b3824ab2280bfdf1ef1e SHA-1: 97f47b51c289666d687a1050e7b61173b46a614a SHA-256: e9871d1a04b37f27f579026615298c93adb33b6ea2ad4c0f62cf04e27f715729
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it likely exploits vulnerabilities or serves malicious content. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and potentially disposable hosting domains. This suggests an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f769f351af---41429130191.pdf In PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210910/0351418368.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/3c79b47292dea2717a03453ba68b5f50/23155839599.pdfIn PDF document text
    • http://nontaromclinic.com/ckfinder/userfiles/files/67840788327.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/46816648258.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/wazoxekoxewufe.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/41019761128.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/xafozirapakezudozu.pdfIn PDF document text
    • http://radecznica.pl/userfiles/file/sizewokefowosipowowegizet.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/lofejejuv.pdfIn PDF document text
    • http://surestegc.org/documentos/file/sojelaveliril.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/pivugujujeguwezopemiki.pdfIn PDF document text
    • https://vanchuyensahara.com/site/files/xinegevoxu.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/bogakefilasiw.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f09404c501---vuzuralugebar.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16154224ac0c0b---17139874496.pdfIn PDF document text
    • http://builderall.info/userfiles/file/lurirofom.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/revitogugojan.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/3691587945.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d73fb901cf---68191206201.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/vanelor.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131ee246588c---pozolujozenuwobejazoz.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/90035320986.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/d1kv5lslsdqpgkvjjr4uf17i43/43525374905.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/71385327806.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=harry+potter+chinese+pdfPDF 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_off0000b26f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB26F 16072 bytes
SHA-256: 48e57afe094dc1ff5d923d1c8649d898fe9abb841701743a955d85c0e955ec14
font_01_sfnt_off0000dbeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEB 10776 bytes
SHA-256: ea62313777d275fe8d2de847d279cde7ead14b96d3ef465c1b054161e08a9f3d
font_02_sfnt_off0000f4a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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