Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aee9ee41d731653…

MALICIOUS

PDF

87.5 KB Created: 2021-09-05 03:24:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d9b96178566d04f6f9c1ac299d1e9bc1 SHA-1: 1a6113b56e628c023c334c927481165282edc9a7 SHA-256: 0aee9ee41d731653276faadc7a6333b635fd4d4d563f7c61b494313acec532c1
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to websites hosted on compromised CMS platforms, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://brianhigbielaw.com/UserFiles/file/zowovusuwudu.pdf In PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/8bc7385ef8cfa1f201e439ab096d5993/86647003942.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/29457991088.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/tubidebe.pdfIn PDF document text
    • http://sxcec.org/userfiles/file/gawosabibujo.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160769ed1ee697---5481508493.pdfIn PDF document text
    • https://auto826.com/uploads/files/pijorakinaxogapifezopojab.pdfIn PDF document text
    • https://bursac.net/userfiles/file/62301278072.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095752f7b19f---31262555101.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc7e52725a---85176547241.pdfIn PDF document text
    • http://nieruchomosciklodzko.pl/files/file/noxazuromuwuxena.pdfIn PDF document text
    • http://ozona.pt/wysiwygfiles/file/puximuzidik.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/3qlhkkat1a67kihkjp15i3s4o1/19319969485.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/3gs1rdpkkcln4vq265dpheiod5/72340097643.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210902_D772DA8555C85709.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/lezojigu.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/vejobopedanojujopew.pdfIn PDF document text
    • http://www.centrosanmarco.eu/img/news/files/xotogif.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210620005138_898370398.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ddcc1808bc---14825562966.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/79513335386.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b08d4b059---40563669595.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=curve+fitting+in+numerical+methods+pdfPDF 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_off0000eea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA6 18304 bytes
SHA-256: 4f777717bf66bcd95fcc58ab2ae083359f3263c1be1d749ffd641efb6bf9f8c1
font_01_sfnt_off00011e9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136B5 11264 bytes
SHA-256: 144198fa6659387707908a507cd38906e20a386b6991be7d80c15bd29fe89bbd