Malicious PDF — malware analysis report

Static analysis result for SHA-256 246c24ffbd5a4fb1…

MALICIOUS

PDF

80.9 KB Created: 2021-09-03 19:11:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2860c81ed25fbfbcbf084476c3620a19 SHA-1: a169f8c6b18d1c92cf200192340f946674bf8c3b SHA-256: 246c24ffbd5a4fb10d9b6ab4aa01fc014ca39ad3a968d4b9cc7712d0c12bbd98
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, with several pointing to compromised CMS upload storage, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's structure as a link farm is designed to lure users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://www.coverseg.com/uploads/ckfinder/files/labunifupozebow.pdf In PDF document text
    • http://afslab.asia/upload/files/tajafe.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/35afa7c96f5853a6006b0e263c6b250b/latanujejin.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/72563210674.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/zotopemenetepuboni.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b43637a01cb---21671085731.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/15935718458.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4985045fc---64149363742.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc87d74c64a---58001440205.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/63qpuiar6jho8btqu9tmjvoig9/sokukusiwulemubipuru.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b8352962b---1712688409.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/zebosigir.pdfIn PDF document text
    • http://cuatudongnhatrang.com/uploads/files/jojaxisafemula.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/gifariluvu.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/54895587238.pdfIn PDF document text
    • https://optical-axis.com/uploads//files/202108060026239719.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1f4422220c---19820319388.pdfIn PDF document text
    • https://wsbtitan.com/images/file/23880179503.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/9bb1bb0f0fc0177af05f2d237c34a203/81188485906.pdfIn PDF document text
    • http://togetherwewalkny.org/clients/2/24/2411cc079aa0f0d7fd57f81c6163ecfd/File/14225601199.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/dokufolipiganopusolagonib.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/40985385250.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/8be2041789285e6c41aaacf3b3592006/riwado.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/p2et5spag63g7mi5cj1gtj9p62/6864727918.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160972e4aca143---97711536283.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/jusokuzo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=livin+on+a+prayer+piano+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_off0000d9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A6 10316 bytes
SHA-256: 500668ce1b52000b1ec79214fd74b0dc2fba672af399797cb38434a276410a8b
font_01_sfnt_off0000f0fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10910 17048 bytes
SHA-256: 3a3378318e9fa62ce84cb0c3e6513472ee04844eabf01b12174153fb5403497e