Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed17ea6458d20301…

MALICIOUS

PDF

80.4 KB Created: 2021-08-15 02:19:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 41eda87936853a7714f241331c1777ea SHA-1: 9f08eeadcbdc2d29f6a2bc3b143a308d401f2778 SHA-256: ed17ea6458d20301350338e09c92a62931aa4c6f7bbc69b2004f777fac81181b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF functions as a link farm, directing users to potentially compromised WordPress upload directories and other unknown hosts. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://n95america.com/wp-content/plugins/super-forms/uploads/php/files/d4173009317b76ec4c58cb77e901e37a/dosabodemi.pdf In PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/bd2dab272c4b26aae040ad3e82e15571/27185151609.pdfIn PDF document text
    • http://adveotec.com/img/file/95130828744.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/ruzewon.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/21467733671.pdfIn PDF document text
    • http://congtyvima.com/images/Download/movifusitalojewu.pdfIn PDF document text
    • http://lawngo.net/fckfiles/modovasugomajovepif.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9d4ac08d1---rafezeveriditibi.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/9839781054.pdfIn PDF document text
    • https://fultoys.com/userfiles/jufisisuwilawojekadad.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/c9h75sigo0d7fi6d95a5t1edcr/daposoviretamulano.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/23885994032.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb112d2c20---10109563162.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba1aa24a8a---gapesejasuwovo.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/1506821154.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/sozivo.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/970cb38637dd37e4ee981b10519c06b6/balilibona.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/mixerobamiwoponavafawuk.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/vemixavebel.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bea92f5ad1b---35249557294.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4b875b8f0---sonerisa.pdfIn PDF document text
    • http://iphysiology.ru/upload/39812856694.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+download+3ds+games+on+sd+cardPDF 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_off0000d82b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f03d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03D 16356 bytes
SHA-256: 9e0c8654c1ad414c1e86575c824a5092d2af708babcd178e353e7e911cf1681e
font_02_sfnt_off00011ac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC2 10868 bytes
SHA-256: 13496955ddd39e42680b89482231137c74d47517d9e7131f00d6ec55a99cd122

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