Malicious PDF — malware analysis report

Static analysis result for SHA-256 e46891d1797c3287…

MALICIOUS

PDF

89.6 KB Created: 2021-06-26 02:06:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b413ff23348f56e4a0a53cfb8afbf7bb SHA-1: ec1fea84ed50c24c1e07c50a938006ef12deba69 SHA-256: e46891d1797c3287e2c31292194290498e3721138e1d4aeaf3b8e98f197e9090
156 Risk Score

Malware Insights

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

This PDF was detected as malicious by ClamAV and an ML classifier, indicating it likely contains an exploit. The file functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload storage, suggesting it's designed to redirect users to malicious content or further stages of an attack. The presence of multiple compromised hosts and disposable domains reinforces its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://on-video.com/movies/movie_data/file/tupuvuma.pdf In PDF document text
    • http://www.annaleehuber.com/content_files/file/85044492059.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/cd44edf008a4808953561abedb3572f3/lonenoruderibelofe.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/vejota.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/22ac85bef3f273de4b2933d9a874f697/43615420821.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/16e7d0335b497f2d2ce3e904331d0152/petofegub.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a076f180247---taloxukux.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/1j90kepo8hvjvqnsnsavma451g/xuxojetefigozuwomu.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f792c1a16---70298419062.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/66363247298.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f288ebc88---80875338126.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/98721080423.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c239446017f---48945829563.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607002aec5eea---vazibo.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/2014362258c228f5a21dd2f6f6484b15/xotesugilewun.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/47606633320.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/16245687902.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/duzugupupudurubej.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832fec1cabd---83133110629.pdfIn PDF document text
    • http://praguetransfer.com/files/file/wivezapisifa.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b453d57e5e---86878176398.pdfIn PDF document text
    • https://shopabrang.com/images/files/rofesakixaxetojemup.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/munonol.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b85eadd1140---15131748399.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=grammy+salute+to+the+sounds+of+changePDF 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_off0000f703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF703 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F15 18160 bytes
SHA-256: 4498fb9abfbce15bda5237c50dc06e3f01de1aa875887a5c7a5dd32aeba96121
font_02_sfnt_off00013dd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD4 11084 bytes
SHA-256: 633c468e6429564a1c3c557cc03a4b793c67b580b4b6e3b30b5083e5e0e2af2c

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