Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c062b02e46369d3…

MALICIOUS

PDF

73.9 KB Created: 2021-10-10 19:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 375fffa05804ea05455d9546a8d80322 SHA-1: d424d0197743255263d0956a7468bb37c321ea94 SHA-256: 9c062b02e46369d349e4e8bd3257b242d7cd7da16e7821695607734bc8f48414
164 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. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The embedded JavaScript likely facilitates the exploitation of PDF vulnerabilities to execute further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=harbor+bait+and+tackle PDF link annotation
    • https://bharatbiodiesel.com/userfiles/file/vifumikipapakugoxe.pdfIn PDF document text
    • https://eric-parnes.com/ckfinder/userfiles/files/mudakonev.pdfIn PDF document text
    • https://bookmyexcellence.com/bookmyexcellence/js/ckfinder/userfiles/files/defuremipulemeludezuledi.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/43130928965.pdfIn PDF document text
    • http://cosmeticdermatologymiamibeach.com/uploads/data/files/wabesuvevapowaja.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e5a75c593---17076086843.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155788d68842---lumevefizivudaduzedu.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/66037984744.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/72823552893.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/ramun.pdfIn PDF document text
    • http://trovas.com/userimages/zedavunagomoxunim.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/33848665114.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/0600697399237a6db201271793a9cfad/mikepagusavoxijimobuburep.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/xegobuxeguwulawitopexuko.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/65182d10e47620606b1b8cbe6b460e15/pemawetesuvibupoxopoleke.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/8344340527.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/sejadomitifawudewor.pdfIn PDF document text
    • http://gemcom.org/userfiles/file/57383445660.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153f3bb69105---52901395408.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/21357639688.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/vamuvibab.pdfIn PDF document text
    • 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_off0000bcac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C3 10416 bytes
SHA-256: 8298a8e6a93cbf7659c7e9a0eb10fe336b2baa97a1ad2635fa8920ccd7df43b6
font_02_sfnt_off0000ec6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6A 17796 bytes
SHA-256: ea5e0bbbffcc625b6456dcfd1192122533dcfadf7ad37aef3e93c586413d51c2

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