Malicious PDF — malware analysis report

Static analysis result for SHA-256 f46179008e6257ff…

MALICIOUS

PDF

143.9 KB Created: 2021-08-08 12:53:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: debb5b5b6a776a3ed229db72f28291db SHA-1: ce73869b1c3259129ab8f142000f2aeb4fb0337e SHA-256: f46179008e6257fff641b27e7e25fa9fcf36374166aa40c5643d286cdb4885c4
236 Risk Score

Malware Insights

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

The PDF file contains numerous links to external resources, many of which are hosted on compromised websites or disposable domains, suggesting a link farm for SEO poisoning or malware distribution. Heuristics indicate it's a lure for password-protected archives and remote support tools, commonly used to bypass security controls and facilitate further compromise. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of vulnerabilities or the delivery of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://wfbulgaria.com/uploads/wysiwyg/files/xamukuledum.pdf In PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/f5439a0f4794d82bedc1e931028ed6ae/fogufodadomilul.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/zawewimoxuligi.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/25303005227.pdfIn PDF document text
    • http://agierresrl.it/userfiles/files/zevanuza.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b3405a0f1b6---22122777344.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/20809245891.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/a389b73d5d4604405f08cbf4a55c24b7/75903445311.pdfIn PDF document text
    • http://rafaelokazakov.com/file/kamiguta.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/11b4e22e70d10d13fa370f23a5e681ce/bapasabikuzig.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/jimiwigaruvevivafulin.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16095f91586c87---pemetemulutijapopogav.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/bc3c5020d31ea6c8d596774bce3b60bc/pamidopanovenozilukas.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/543caf1a623d9768e809aa2775127c91/bapagadawimaxiba.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160fc3dca02cc9---gujiniwevomuxawurur.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/46901204186.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bf88f906b3e---46193500430.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/bj838f8vtdk0pm2bvi4j71s020/vekifuwuwumafexulazovotor.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/b37c0fb2a1d6459d637442a3efcd982f/burosifarapotajesa.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/favagezunomupafafenilopap.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/7jpc86fg1l5qq8av9e55ovpaj7/81337149579.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/44jh2t5bcuv0bk061elelsssic/gajolikurinopatabixijew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=autodesk+autocad+2017+serial+number+and+product+key+crackPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b1f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B1F3 16376 bytes
SHA-256: 0c133022d1e9883d2ff7035cf84f1fa0be9cfa0d671266bc5a940283bc0f9855
font_01_sfnt_off0001c81b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C81B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001e02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E02D 20864 bytes
SHA-256: ace6c0095f2dc1855f1900f98d73be9fb2c1f7f187ffb04a2811e2036c8398c4
font_03_sfnt_off000215bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x215BC 11448 bytes
SHA-256: acb34bbe4273044b8cc9e52fe8bd553e8943db6a1e8c5ae9af17cba506e5bf55

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