Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ee6e0738607e505…

MALICIOUS

PDF

87.0 KB Created: 2021-08-06 14:56:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9ab499a6de536379b3131dafd4dfd1d8 SHA-1: 0e8714b3af259f8ff14f0c3c11ad9d162e39cf96 SHA-256: 6ee6e0738607e5055398ef3c252bc063dcddc334501665a18ea2f01a0339cad8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection further confirms its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://oniceh.ru/uplcv?utm_term=how+do+you+become+a+certified+ophthalmologist+assistant PDF link annotation
    • http://casaledellasignora.it/userfiles/files/60433656011.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160881ad7d97d1---vasejozesogofade.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/dbf4c23e9059b50524c1c99a9585d55d/bugokuweroxo.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/48497173046.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608901f5f3936---zutuketugipunogepuxegalel.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/83324893690.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160fea0e5c0393---kubakasasikotisamewuv.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/81573598733.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/dufijemeno.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/jewesajoraviduwusukilivi.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/2251372f4813695f5fdadbd8893093ea/lexodiniduvikivanedax.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/58346419176.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/6046304866.pdfIn PDF document text
    • https://campermagazine.tv/public/file/rozura.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/kujakobawizixuparixozolep.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864098761e1---69866887812.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/f55e0d657a5432740dde68472d6fbd7a/38276562626.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/108ggtm6ltset9o2m253go1ta7/jabebodi.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/44229681411.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160943547cdc62---muvirixasovi.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/45997906270.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aea3737154d---bafikularod.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/bokajupoxivajunonijilo.pdfIn PDF document text
    • http://stepsforstarlight.org/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/30931070618.pdfIn PDF document text
    • https://metnar.pl/web/uploads/files/fugokakana.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_off0000ef3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3E 16988 bytes
SHA-256: 622fa5946f309971d810e4224d55b9915faeaed76f760740f060724b0897cd98
font_01_sfnt_off00011bd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD0 11496 bytes
SHA-256: 4fb61df05f4e4d86494e7bfcb03dfb0710b70c864834ed5457787b6d8ea4807e
font_02_sfnt_off0001366a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1366A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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