Malicious PDF — malware analysis report

Static analysis result for SHA-256 733bb9e708819c31…

MALICIOUS

PDF

61.1 KB Created: 2021-09-14 07:27:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 10161d6903f6620c7dcb67cb56369e1b SHA-1: dfe6f2c1647ef0f8a1f193adcbb5349144bef1d8 SHA-256: 733bb9e708819c31f42538cf17220e039313e62bf6d6c6d4b20ce452c104d9d3
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and a significant number of external URIs, many of which are hosted on disposable or compromised domains, indicating a link farm. The presence of embedded JavaScript suggests potential for malicious actions beyond simple redirection. The ClamAV detection and ML classifier further support its malicious nature, likely used for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5897

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.
  • 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 http://tuvantindat.com/uploads/2021-09-05/images/files/71080289426.pdf In PDF document text
    • http://showdoimovel.com/files/files/72868086387.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/37676978920.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137c0bd9024a---xidusan.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/91079410114.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/wazefunotanifuledoz.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/poguto.pdfIn PDF document text
    • https://hankilfood.com/userfiles/file/20210906003547.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/43861599884.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210904_F251C8FCFB06B9BD.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/6069929796.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/50847452331.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/96189086259.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/gureka.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff95f79506---lusezaniga.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/kurujafo.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/xabesozikixivok.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/40559254120.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/41694088182.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/nozetamumirupinobunu.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/2b6f7402008d50a4ebf948916891e128/5478137693.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/gitaj.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/vavosazo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=best+android+launcher+apkPDF link annotation

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