Malicious PDF — malware analysis report

Static analysis result for SHA-256 8378f028bff09904…

MALICIOUS

PDF

64.3 KB Created: 2021-08-27 23:54:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bcc57ea5dc28c41a3556b07e2ff8aef0 SHA-1: 0335520b886d0fc58e81556a7b87c01b72e6d29a SHA-256: 8378f028bff09904b41b09c832b56d6b20116d64c1e070a4932922d89302ae90
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external links suggests a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5933

Heuristics 5

  • 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
  • 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://inwebjor.ru/uplcv?utm_term=miss+mary+song PDF link annotation
    • http://forter.vn/hinhanh/file/67638777455.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///71159543950.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/vuravavizuperup.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/52494908430.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/42661855546.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/0e114043d1e3a3d16f2fc3d870ef9337/95024632377.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/3u32aqgdqs13v01use8mhhps07/34783187838.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfc86894ea---52090484503.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/8i6cc0tidskebpohd5qi25es47/dekege.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/0feba32e843d8bf4f4bc98def7a253d2/kisebelawupufokimujatubup.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/toladenumifa.pdfIn PDF document text
    • http://hasadtemizlik.com/upload/file/lilubajuzovakavuvikojiso.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/aa29eb222f88c33c9e7d4f1f981229c2/rodirufaliwamitesiwubozop.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094d137d3ddb---13021744179.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/97694246030.pdfIn PDF document text
    • http://reikihaus.com/clients/75291/File/movubujobun.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/bizopuraxosexupu.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/mmhe29dq4he2l3c5q0rjga9ths/33057735436.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/49172840106.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/sinosut.pdfIn PDF document text
    • http://opersan.com/file/23895922909.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611039f1b6665---nifunala.pdfIn PDF document text
    • https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/15618336762.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB718 15004 bytes
SHA-256: 95a7117d705c25998190f0dd4db3488af41baf650826466384e3c431cae93074
font_01_sfnt_off0000dcdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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