Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc9925606ae96037…

MALICIOUS

PDF

89.2 KB Created: 2021-08-17 17:58:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d1e6d96d859168557649ec40985a8480 SHA-1: 91c08be8ca387e0b10bcb344c8841bfd0d0b86c4 SHA-256: dc9925606ae96037a2cee079ccb708820992b5b4fafc36856aa0ddab92c2614c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on compromised WordPress sites, suggesting it functions as a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics point towards an attack pattern involving directing users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://ketchas.ru/uplcv?utm_term=why+is+my+directv+genie+flashing+red PDF link annotation
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5e93b6e11---gesasulibapaxofixuka.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/76977066007.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/4449366354.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/ei63uk1toe6172g1go14mpmbn2/14449433303.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/25562221488.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d01eacab96---35776686116.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160911b4077afe---xavaronaku.pdfIn PDF document text
    • https://koratspring.com/upload/file/gapujujo.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/gakewevuxe.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/da700fc5ea62ccae715770292cc7cc17/39700072154.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/ee8c7790d478f11074a67e8543cf8bc7/95315690612.pdfIn PDF document text
    • http://jkohut.pl/file/barizujuruzipigimina.pdfIn PDF document text
    • http://houselandia.ru/files/bamifivixoxef.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/98040257153.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/10277267702.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/legididifimotonapo.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/957d75e1e7f6b6d9e5ab2783dc1d22c9/55416442295.pdfIn PDF document text
    • http://vhs1962.com/clients/b/b9/b967f936f519796c2a696a6ed1da67f9/File/vabijitalor.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/a1c3d0ad8083747d7b03027620e9ea9d/3538655514.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/91714497688.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e2e3573c855---35108194797.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/vamisekalezuguwi.pdfIn PDF document text
    • https://palet-school.com/files/files/tobepekulukoluz.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610ad3567f055---80055814539.pdfIn PDF document text
    • https://iguanapools.com.au/wp-content/plugins/super-forms/uploads/php/files/4ool5j8n4q6vepp876j7vne1u0/fejazafutafemege.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_off0000f564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF564 10976 bytes
SHA-256: 4e66524e747d7addb8311bbfefe5c9efe8e908dc0170bb8535475bd8cc7b3331
font_01_sfnt_off00010e76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E76 17740 bytes
SHA-256: ced5f96b0bbbbbebb2d0d76f217148f26be392278db85cc0dff0565a75631ab1
font_02_sfnt_off00013d85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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