Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f39ad9bb9d1ae7e…

MALICIOUS

PDF

69.4 KB Created: 2021-09-02 01:00:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9c8c49e778de817de32f55a501fb9d23 SHA-1: 1667de03cfb5e9e5d40ee074bdc131168be36081 SHA-256: 3f39ad9bb9d1ae7e2f3ab15e2844bddbaf48292c6b26b90cfd87971f42c98446
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=team+family+feud+online PDF link annotation
    • http://axiomestates.com/userfiles/file/10129987675.pdfIn PDF document text
    • https://vnmmalta.com/userfiles/file/puviwiramekudedof.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/90020297959.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/90761478821.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/sukaxupofemet.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943cc564e32---16787335313.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/52700248797.pdfIn PDF document text
    • https://basisangka.com/contents//files/jafigegugutadudeni.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/10571639776.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/kibavis.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/9239167838c2cf8ca6fe512effbc982e/88895322843.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/valuvos.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/xomaxivix.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/723404092.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/48905796235.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/gje6fkg596tuhdiced95odkls3/relezetozivosituzujuxu.pdfIn PDF document text
    • http://lawngo.net/fckfiles/18701220533.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/85470546021.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/dagutexuviwexep.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/xefew.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/ttnoau9dqrajg055bph8l4q8ed/20309858292.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/bc14c3e2d27c2073ca893b02df605b75/51013757110.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/rpk3clju003ns0j90qouspoafe/wubovirerixarawub.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/f333dd0d0e8461db8b94a676b264245a/rajubeko.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_off0000b4ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4AD 10328 bytes
SHA-256: 4b1074ce1712faacc107f83b4e066572966cdd5fd30ced13d583a2495c89cea0
font_01_sfnt_off0000cbdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDF 14704 bytes
SHA-256: 077abdff397d0a0e24e1be1f805eebe1398548ee5d462e0adf29258385328812
font_02_sfnt_off0000efc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1