Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cd25e8a9e29285d…

MALICIOUS

PDF

99.2 KB Created: 2021-09-05 05:55:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3235f5d42a33c8dd70b7a59898b0bd2b SHA-1: 88f78e4e13912e84a66490f652b264cbaf66742b SHA-256: 1cd25e8a9e29285d740927f719d2ff1203361d542d8b2983b238ffa1e5d41aca
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs suggest the document's purpose is to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://medvor.ru/uplcv?utm_term=the+awakening+and+selected+short+stories+by+kate+chopin+pdf PDF link annotation
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/ns6d0nctl0l35ueo2l31bdg2c4/54513305888.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c57fdba6576---37796014064.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/cfafig2t70j00khfcb78trvc35/vafilen.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/surabosatojamivuruvero.pdfIn PDF document text
    • http://watsonwilliamsreunion.com/clients/82103/File/62215816711.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1bdb626a4c---4843694457.pdfIn PDF document text
    • http://transsnabstroy.com/userfiles/file/mebusaxerulapabitir.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a85a47bbb2e---rigovujepozanuresazibog.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/zarovalijasupegiw.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/topuzebavepuvafenoki.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/85709938322.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109032007409200.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16081811eb401a---79205444568.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/54048701094.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b3916b665---98362970675.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d48ed6e2f3---32389367545.pdfIn PDF document text
    • https://tavio.ru/files/file/gemoxiwowerixomoraj.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/xurezuxotu.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/35372017400.pdfIn PDF document text
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/gogil.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/81962941168.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/11045447218.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/3bf41d90078dfdb916214f6d90b57532/debik.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/cc86eca104cd1c194761cf7be1c7e009/xevosejen.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac75975d092---kawuduzu.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_off0001190c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13123 11296 bytes
SHA-256: 68583a19fd17d4c1a8918d47de72e5d75a76cff6b4973667a62e7f41d8c1acf7
font_02_sfnt_off00014b46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B46 20340 bytes
SHA-256: 06944a8c41d51e18cf2a9b320210b9601955938365ac3ca8ba59a0e76c6046ba

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