Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf9384e7309feba5…

MALICIOUS

PDF

81.2 KB Created: 2021-08-19 03:03:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 23cd582ed05e06dfcc4af194925b3464 SHA-1: ec417c9d970c733c264b41cd09797dd3c160d9f5 SHA-256: bf9384e7309feba534e26282d48cf2a2d4a0de46f44f26dea411a747daacd506
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents attempting to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://cructi.ru/uplcv?utm_term=armed+and+dangerous+john+ramirez+pdf+free PDF link annotation
    • http://colescastle.com/clients/875019/File/gewoxusugilobutowuloxaz.pdfIn PDF document text
    • https://chambres-lannion.fr/userfiles/file/35332978325.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/10853555720.pdfIn PDF document text
    • http://geose.ru/userfiles/file/maxegoviriwerora.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/34504801213.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/20234309029.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/6600157856.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/cf0715b7d7124a5f7a33cd6b5de25c40/42055983179.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/76128440591.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffc3d301df---nofefuvijimujexoduror.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/mepib.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/98195221262.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/e7673a05c49b9379722f6a8fde6a3ede/81289766702.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160899d6a907cf---33255022864.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/r17opehpfnbdpgj2s3n8uqq1gj/75334930620.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160799477a5875---dizimufigegefopaz.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/f4fe61007e81e54d80d1ad4386739c50/43490711509.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a156405c66f---kepikikasamizesel.pdfIn PDF document text
    • http://aweibel.com/Photo/file/xemazabidowazotepot.pdfIn PDF document text
    • https://makeswebsites.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/nepufujojebopo.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/fexilutoka.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/xodukixodalowigagokirob.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/zubusodinobi.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/napon.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/75185528766.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_off0000d9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EC 11072 bytes
SHA-256: 724ca78aa3e152984398ee1aa7806f1970149474b0efff4a4981c9f47e34cb2d
font_01_sfnt_off0000f34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34A 16544 bytes
SHA-256: b10255c7e8e9c8d05984fb9398f85a37a6e49259c8d5d8fc54c266d71076b04f
font_02_sfnt_off00011deb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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