Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f138e2b713ec420…

MALICIOUS

PDF

90.3 KB Created: 2021-08-25 04:24:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 4c8b06b17ba6aec87a27d0a40484bef8 SHA-1: 45587b9c976aec315227dff4f5d82634b054e5d5 SHA-256: 3f138e2b713ec420edae0695e7bc5639b32ec1ae7e8bbd64167cc720ad1d5feb
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific intent beyond the presence of URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://archism.ru/uplcv?utm_term=chinese+rice+noodles+calories PDF link annotation
    • http://orlickachata.cz/files/files/82865967949.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/jiwowivirafufenazasire.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/10951168014.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/ditoa8po46oqo5hul4k10adr91/kelajowufibolamuxo.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079613b4d822---xuvomajatik.pdfIn PDF document text
    • http://www.centralperdana.com/file/18929635296.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/zosera.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/34886940593.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/15406464506.pdfIn PDF document text
    • http://moristas.com/userfiles/files/pujepibananadefe.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e830f166ebc---xenedowizinifime.pdfIn PDF document text
    • http://dichvubaove.online/upload/files/wafetenotevejazoxowonu.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781c4ac3a89---gonukozukoreninas.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/xolopujojavivepane.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7f62fcf148---zipatidedazebajiw.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/78887191885.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/99849124737.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/3b52df2e362986322c6984557795c8aa/kaxinuguzosuvigiba.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160daa6450ab35---lasezenunoguxoziresure.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/kokodesivupawotaxolokus.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/vusedorexosefopobu.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/depametilivaremula.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/d6e6a4eb23b65107dffe8d905e64b9e1/86317933050.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/jimijotekifenurezalorin.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_off000100de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DE 10400 bytes
SHA-256: 5a2a6dd4c270f87544aa58e8b8230ce1244b7c0405ccc5f66a78ff703f70e1cc
font_01_sfnt_off0001184c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184C 16588 bytes
SHA-256: 30e13f73af52e88cad6ed3eed011a385f9dda78d101a5fb0af6d0355bdf82074
font_02_sfnt_off00014314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14314 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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