Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c6c04396ae21fc4…

MALICIOUS

PDF

77.8 KB Created: 2021-09-02 11:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f82c556b2136efb86036b118b43efb16 SHA-1: a92c02efdb92017d1c434246129ee45f5bf66c6d SHA-256: 3c6c04396ae21fc4a36fb736f4721a3e020f8a0d4581fc975c01fb3202c10287
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://richwoods1969.com/clients/861079/File/59123597651.pdf In PDF document text
    • http://thanhtindesign.vn/uploads/image/files/vuboragorez.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/52114627095.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089db10b5433---74109491387.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/60593186532.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/32a52a4204e0a4e7434d60abe7780a40/jefumajatisiwudogifid.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/nadumesasanutakutamimus.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076766943819---34299591759.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/bitituzujurezexun.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160c571266b50b---dijukakufotupunojirukov.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/8738943031.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160daf30834450---radetejifi.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/c8985440541ceeb8948dcfb63d89bb09/29853773341.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/bamaso.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16071ce639c113---tujofilojuwojimide.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607859fce10e9---pamukovetejelisofe.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/84982315660.pdfIn PDF document text
    • http://adria-ex.com/images/blog/file/59433665959.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/2938552161.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ef3ac2ba9---24781396841.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/lawan.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/926ad84d65f2632070f6b9181a83e47e/nuzusifekeletejitobogij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=fundamentals+of+corporate+finance+solution+manual+9th+editionPDF 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_off0000c421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC421 19012 bytes
SHA-256: 6b495d71dd2262e38734571a3c6c090bd88126f54669ffef0bec2c066ad2db35
font_01_sfnt_off0000f5b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B2 11132 bytes
SHA-256: 04801c974ab8f28775b55e4dbdd07fa2d8979266bebb90b6ffc53f1532c65bb7
font_02_sfnt_off00010f78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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