Malicious PDF — malware analysis report

Static analysis result for SHA-256 b36980eebf9e86f5…

MALICIOUS

PDF

54.6 KB Created: 2021-09-20 19:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 107a6b7a592601375d7109dd75c59f3e SHA-1: e038c57f6bf80f64edefd350243ed446d9935a15 SHA-256: b36980eebf9e86f5fdae4b107d0421231fd04e2aff7425c035c0400deeaee856
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The sample also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to obscure the final destination or distribute further payloads. ClamAV detection as Pdf.Phishing.Trojan further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6190

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://laborke.ru/uplcv?utm_term=watch+bloodsport+online+free+putlockers PDF link annotation
    • http://www.jacenter.org/js/ckfinder/userfiles/files/darubenolulimon.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/kopobukekepijikixonuxex.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/37897635339.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137ab6886278---natatomeguvuzi.pdfIn PDF document text
    • https://penzion-palice.cz/content/belidiwiwukulufof.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d693e12f6---febenim.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/ludekilizulazonedakoso.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/vezigofolapejega.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/29416749156.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/6j3mavvbq0liq6gedl53a00d23/48965081272.pdfIn PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/mujere.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/19083635951.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/zajemusikuna.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f133e35ef4---9846087361.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/6472214791.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/nesazaxevo.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/36439929373.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/belexitamafisexazalo.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/67337855881.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/letamakam.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/bokadotafefepi.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/c79fb87daf88dc11bd1b07bce4e8b9c8/semiwasa.pdfIn PDF document text

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