Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ba8612a000f1764…

MALICIOUS

PDF

73.5 KB Created: 2021-07-30 23:15:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b41677bb4c98b637c55e161a07998e15 SHA-1: 4b613553d5f15c5d75bea43c8997e5ababfd7b44 SHA-256: 7ba8612a000f1764c1ee103aa92c2303b12fb282a735d29132601c2672f734fc
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution through these links. The file's structure as a link farm suggests it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7595

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 http://madmojo.com/fckupload/file/65468832445.pdf In PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ccbb1992031e3d3f289d94604ca08642/75501796597.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/85395941110.pdfIn PDF document text
    • http://fbchitchcock.org/clients/8/8b/8bdff38a390027835eb24981312b950c/File/18191617336.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/sidunixazujexol.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/4e2b78dd411041b518cc1151ac93aa07/35361785049.pdfIn PDF document text
    • https://fcr-fomentoconsumoerenda.com/uploads/files/94651092113.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/27863668004.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16089e1e0ea505---40404628859.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/61729b7681c72612a6815f369e995a34/wumiruwun.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/hgbtqlmool0lgvies6143t2vo1/47491803322.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210611102208_cgtdy5.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160adab42d7786---zobutunerutaw.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/jesonalirigavurazu.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/videsalaken.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9ee08b78e---zopedewinetu.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a5c56b154---31598652762.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a3db58a3d82---fotan.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609badb0be61b---16758617632.pdfIn PDF document text
    • http://sparkpro.lv/content/file/56623040168.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/mejit.pdfIn PDF document text
    • https://ecoledesgourmets.com/userfiles/file/23496351564.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/e1vtki20sauc44beqkookf8u9f/36288962768.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d94ba8d1573---31668447151.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/cca493d065792aa5b9fe0bd6e190a643/9434509592.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee516e5dae---97962609292.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=sif4+polar+or+nonpolar+atom+closest+to+negative+sidePDF link annotation
    • 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_off0000cafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE311 11184 bytes
SHA-256: 76b531f5fc03ac53813bd0c61ac1320a010146b8a504fdb28c718d210b77f95a
font_02_sfnt_off0000fd07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD07 16272 bytes
SHA-256: 393aa739f9e92027b3d1b9f60dc75b5aa4bf07ad63e50bb73cd519ad13441377

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