Malicious PDF — malware analysis report

Static analysis result for SHA-256 4118655106d4c78f…

MALICIOUS

PDF

44.2 KB Created: 2021-09-19 10:00:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 622127f113da704c7208875e6a2e783c SHA-1: 6b16df9671a899a65e6f1a9155cbf255c75863b2 SHA-256: 4118655106d4c78f9fe8c48c967b9b74493cc2958022b12fd9e88e74fc29c1ae
132 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent. The embedded JavaScript likely facilitates the execution of further malicious actions or redirects the user to malicious sites, contributing to a phishing or trojan delivery attack pattern.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4839

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://crysiq.ru/uplcv?utm_term=download+kinemaster+pro+for+windows+10 PDF link annotation
    • https://asthasupermarket.com/userfiles/file/5868976838.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/1946268026.pdfIn PDF document text
    • http://sprostredkovanieuverov.sk/res/file/58144827800.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/jujigekegesobujamozob.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/puvepege.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/4e7929b8359acb1723e7edfc0eecbebf/95985108360.pdfIn PDF document text
    • http://labsshop.com/d/files/dogekopizamukidomaj.pdfIn PDF document text
    • http://pevak.info/UserFiles/File/wugodowisarefewude.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/zejeleni.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/wigepekeduse.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/kuvidiladeneminuzosakafe.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/47160770345.pdfIn PDF document text
    • http://lovesenergy.nl/file/68391055845.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/44310138007.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/xifiwavavunolumudove.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/30673080276.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/nupufaloda.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/911676295.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021090812583860.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021917655561848.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135cdbd8a19b---gabejoji.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/49385540882.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16133b440053d6---32947669944.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/16312426935YgA.pdfIn PDF document text
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/sasobusarojad.pdfIn PDF document text

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