Malicious PDF — malware analysis report

Static analysis result for SHA-256 65a84987dee1740e…

MALICIOUS

PDF

79.5 KB Created: 2021-09-01 04:09:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b6ca1a6e9089189a6259fb6d574a3b86 SHA-1: fedb06d759df2183327fcc2cd7282824cd78fc4c SHA-256: 65a84987dee1740e10a152da88f2459cee966f6cdc2c008fdffd45cb160005dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/69845287899.pdf In PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/05sne3iroo4fb3nmp61vtt8tu5/tagixag.pdfIn PDF document text
    • https://vyrukrc.lt/userfiles/file/37809101956.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/wuvanikenamogovawuxurot.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/b1j6v9eg24et5rpkd7bro0duv9/javavukipewuwimiworakaxuf.pdfIn PDF document text
    • https://destockbaby.com/ckfinder/userfiles/files/vutunomuwux.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/81de0673491f56c435425da0d20173aa/79080694498.pdfIn PDF document text
    • http://capital96.com/userfiles/file/25052966186.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/7a7cb6b8ac3f1c50392629cdfb047fe2/46811590441.pdfIn PDF document text
    • https://coluer.ir/documents/file/bivobav.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160794fddb5d1c---dibababirixevubojarula.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/goxavorefunuxe.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/sejovuzilawozipenuwus.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a7112eadf---81362119313.pdfIn PDF document text
    • http://tucholainfo.pl/userfiles/file/21108757430.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/jumebuvipunudaturesadofiw.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d3920d79c---86101177889.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/povasadabogovu.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/sutisawukenilowebujapox.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/54368972801.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/62526166912.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/98962513492.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b2fba22f48c---jowenigafiguzarofobi.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/diroxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=agriculture+and+agribusinessPDF 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_off0000d48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48C 10648 bytes
SHA-256: c9dbaf199f2c79bb18d9a871b68d58b9f4d7b67586e144635f210a8d939c0183
font_01_sfnt_off0000ecd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD8 16608 bytes
SHA-256: 66bc410de3262b4803ad80cdd919ad17f57158199c35bc6ade2d65bf6a34947d
font_02_sfnt_off000117dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1