Malicious PDF — malware analysis report

Static analysis result for SHA-256 dea5dd2517099d03…

MALICIOUS

PDF

81.2 KB Created: 2021-09-05 17:09:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 55b206a3626c9bb9ae8778c904f9ec4f SHA-1: 4e8714fb590eb95bad94caab6d0380e78af5b875 SHA-256: dea5dd2517099d035748715933ee0f170f193ef1149aaa7cd19484e21836bd6b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. The presence of external URI heuristics and compromised CMS upload links confirms the redirection to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://medvor.ru/uplcv?utm_term=opel+corsa+d+manual+de+utilizare PDF link annotation
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b14f4c5e654---15583486965.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/jegakozafatu.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8dc7ea5e7---5359748033.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7818c477d---basuzadifexuvino.pdfIn PDF document text
    • https://koratspring.com/upload/file/16476353344.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/vegudilabisexaker.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/vakumituwedanokega.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/2d54db5254fae27f562a83c065d8262a/tawapalanasewaxuze.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/4cda6c97ee4fc5817fceb0366df3ed7e/56818477045.pdfIn PDF document text
    • http://bougerpourstarlight.org/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/80575618096.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/99695341358.pdfIn PDF document text
    • http://genbreedpublisher.com/files/upfiles/file/bufinivimovegimojageni.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f055c187131---88192419013.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/wivodobodazabexosefag.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/87549825456.pdfIn PDF document text
    • http://homeopathyhk.com/files/41405071792.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/903d2ab1d54c7c245785fd8cc87d9e64/gelexesiziloxogog.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210519215520.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d70f4262d6---31030598619.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/baxunipowukopuzezenur.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_off0000da3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3F 16756 bytes
SHA-256: 92b5c18cbd72ed6dcfcab79c8281ddc470ae649bb07a49c777162f46eea88c20
font_01_sfnt_off0001060d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060D 10860 bytes
SHA-256: a7de9487fdda64b2f167a3257e9f4178cb671286a6838bb4a02e88b19f098c6c
font_02_sfnt_off00011f32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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