Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6fab3b5c1bce39a…

MALICIOUS

PDF

76.4 KB Created: 2021-09-06 13:24:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8bd2d79f6ebd1f8abe7339d9fd6ab978 SHA-1: a3311830f86312195e5e4ad8345c1fc5a1389209 SHA-256: d6fab3b5c1bce39afeb11dc2b3f21cecc29b4894afdac9f395fc0db22c6848bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate that the PDF is likely intended to redirect users to malicious content, potentially exploiting vulnerabilities or attempting social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://catamma.ru/uplcv?utm_term=drager+oxylog+2000+user+manual PDF link annotation
    • http://kooijobs.in/ckfinder/userfiles/files/wipagowatupeburizuteluvif.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/2484d684d8f7aa67d9a3b26c49f8c3a6/8992074126.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/tajepakatimapuvudarute.pdfIn PDF document text
    • http://hasicimosnov.cz/foto/Image/file/wixelujuwedegikag.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/29780806945.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/6851cac4a2c15991fc47325476a106af/20818600750.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/78663499266.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16071de70a7c9f---xenimomuvuvebeboj.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9251123854---gadego.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210831_5B840C75DFB1CCA0.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ceee3a2740---raxilutobegizemazoxid.pdfIn PDF document text
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/luzukezowunudexob.pdfIn PDF document text
    • http://hoacanh.net/luutru/files/15456939155.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886dce7b15e---rufanulipuxewepezex.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/dejezofetazovuzopi.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0cb4c99f6---2652849669.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3eac59b123---wevow.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e03c5228f---95875311298.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210814204535.pdfIn PDF document text
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/7adhfo1o0uqaljaee7tiro1fe1/65781825816.pdfIn PDF document text
    • https://www.nevjegykiraly.hu/userfiles/files/23960603576.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/rifopasetamujafuluxa.pdfIn PDF document text
    • http://adveotec.com/img/file/33353975258.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/53ec0b3897fef01384e4fd095739253c/46843832543.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/ea0283d2991d991c7b1442d0192a977e/vuvowubiwotopasa.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_off0000c7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C3 16820 bytes
SHA-256: ee9020d8b80164bfda73ed2fe9d72602719e2041ad72edd41fb46d58abb6b911
font_01_sfnt_off0000f2d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010aef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEF 10820 bytes
SHA-256: 26fd3089c944e07db6b17aad099be13f1dcbfa28169a68398774d43487363b69

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