Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2ae1518d60267a2…

MALICIOUS

PDF

79.3 KB Created: 2021-09-01 23:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c2ca9d831488017274b4dea01e3b8ffd SHA-1: 2494b415afa1b365bd1d1fcb6f80b08e2f96ba31 SHA-256: c2ae1518d60267a2d64ff5bf932c8acbd6019cf51ae8d8518d3094dc6ae23e44
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains numerous links, many pointing to compromised or disposable domains, suggesting it's designed to lead users to malicious content or phishing sites. The presence of external URI heuristics and link farm indicators further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://coebmsf.com/userfiles/file/tobubegi.pdf In PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/6112106541.pdfIn PDF document text
    • http://hzdshg.com/images/upload/File/puranetedovamobif.pdfIn PDF document text
    • http://namlongprojects.com/images/uploads/files/guxusavixikafem.pdfIn PDF document text
    • http://susanirvine.com/clients/82887/File/38849505664.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8a2285568---88693038142.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160841adf3edc4---42917995086.pdfIn PDF document text
    • http://www.bash.cl/media/file/xobopilonerokozowasusan.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/24171302758.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/73692c879ffb4f914f4316d2fe1747d4/6423910870.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf64c9b5e0---tedujodotaje.pdfIn PDF document text
    • http://www.terresdescaraibes.fr/file/fojekusijenixisowemak.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/46506350bf943cc92b78a1a5a9fe6722/ziwuwovegepikisuwafijivog.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/ct3s362526hjgtmr0qagp0oj72/73909111650.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/56743744918.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/96805661650.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/76022701673.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/h0g3fr7hm2o9c92o011fvktagp/89121035533.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9289ca267---pezefun.pdfIn PDF document text
    • http://cutencuddlybreedables.com/_images/file/kowukegedejetitamu.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/tapubuxamipewe.pdfIn PDF document text
    • http://aiaciran.org/cache/fck_files/file/fesaga.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/48195004337.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/96045882331.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5c7a3946d---gagitipafivesawo.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfddad48e5e---35058498529.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+many+years+is+7+generationsPDF 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_off0000d277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD277 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8E 10648 bytes
SHA-256: 2f6aa03346da5415a87622addd5b6d2178a2407b00333fee475fd3d4154d6f6c
font_02_sfnt_off00010306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10306 16964 bytes
SHA-256: 4c7583854facb6db3a386ea7ecb31849db0211d9a2b15db88342eeaf56f9cef4

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