Malicious PDF — malware analysis report

Static analysis result for SHA-256 367f58bf0b3b19f3…

MALICIOUS

PDF

91.4 KB Created: 2021-07-19 18:24:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 190b76d15a27807e68266bb1a31c823e SHA-1: 244e94900a3e76026991b4115f3c0fd13a7846a0 SHA-256: 367f58bf0b3b19f31dc03e8f2feea2a31729e2d572b9b4377a1eb6a1a8c7b8c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or SEO poisoning, by leveraging these links to lead users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://searchlink.org/userfiles//file/90054169487.pdf In PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/fq2co1k9pugl5j2dhlj4ro7u2e/bokapokubekute.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d23a6e05a---zisepura.pdfIn PDF document text
    • https://bayihoki99.com/contents//files/37582378437.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/nedaresovabiriwefa.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608371bf24af6---mojumejurudogoposesajodox.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/zisidarivunedimezowige.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/87312024810.pdfIn PDF document text
    • http://poolprotektor.com/userfiles/file/xidutajigorabuxakazajaxe.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e3dde5208---5220130196.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/d06dc11a40a43c76d08260c7e9d8ca8a/86063861076.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/62839738198.pdfIn PDF document text
    • http://dfh-consulting.com/userfiles/file/mozurebamideboveguxuz.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/00616d9efa5c9a2975e7a9885dc80eeb/lanedemafadozamegaretobij.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/12372155427.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160aac12fd263c---tesuto.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/f700685fa79b9fb73d8d754103504bb0/keromororisunurak.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098c8a70ea56---1807569581.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/zunekowifekizike.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/rasekakapitopodelemow.pdfIn PDF document text
    • http://www.kammerpop.de/files/file/75967054877.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/d9be2mn2hei4nat381fd51s21v/98735389458.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=dog+whining+at+catPDF 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_off00010627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10627 16844 bytes
SHA-256: a9f4d1d41b7c075891181e269a24e8c289089bbb71fe8fddd863af7473f23700
font_01_sfnt_off00013201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13201 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A18 10152 bytes
SHA-256: 09d89b1b21eacae0b8e6a372526ee92e6f9973631e27f7c7b33660055555d5ff

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