Malicious PDF — malware analysis report

Static analysis result for SHA-256 242159acb078db3d…

MALICIOUS

PDF

81.8 KB Created: 2021-07-27 21:11:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8a71cfe0d979b26f4652985c100bf463 SHA-1: 3d88f3d865f1ee978dd26068c3c449357ef2502a SHA-256: 242159acb078db3d14dbcf13f6dfa7bf8ef2a0531dc458260d5b4093d85ce9b1
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to websites hosted on compromised CMS platforms. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate this is a link farm designed to leverage compromised infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/4imb7a0nfl8t3ctl32d54gietg/86957360157.pdf In PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160dd9b3985a71---3762717547.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/52942719948.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210623022053_sil3jz.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d0339a0f2---putexamav.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/99650387975.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/59810912391.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/8b6b8aa8b06af96f546bbb59961facc7/xegikotizolavokerixixusel.pdfIn PDF document text
    • http://burke-gallonfamilyreunion.com/clients/28163/File/ralaxetimoz.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/195efbff19374bbed5befe7e2b4c5c01/lesogupiwekonowanil.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/wawipena.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/598fdde9852345b7b23d212dbe23f553/31327433950.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/50653299307.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/49f7f68e21e9f21db83ccea0300319f1/63509589304.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/68527217351.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d245c38f80---85557692267.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/40733726962.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a8497075644---8329952034.pdfIn PDF document text
    • https://mollis.rs//files/27168577455.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210624_70320D7EAAEA546B.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/9e5024fda10dd3f33e3648f67089aeef/jijatevutizozukunukotepes.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/komozanofululofa.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160c5902226aa3---19290002169.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/59281680813.pdfIn PDF document text
    • http://1975geegees.com/clients/78603/File/60038334654.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/zesaxinerabimusezo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=melting+point+of+benzoic+acid+lab+report+pdfPDF 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_off0000dbdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDF 17064 bytes
SHA-256: 943423a28a9c8457165b10efd69e4abd9b1f67ac3934e721a92ee7d73b86022a
font_01_sfnt_off000107d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF0 10820 bytes
SHA-256: 4e770d246dffaa207851c2cb2d87504efeb2fc3a1da8b7640d7ad8b585700654

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