Malicious PDF — malware analysis report

Static analysis result for SHA-256 7395ae9d4d999434…

MALICIOUS

PDF

44.2 KB Created: 2021-09-12 03:03:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7f5cb78d022b01cc7306ea0e436272f3 SHA-1: 747f8bc1ee7061246c23860388db332ce7936d25 SHA-256: 7395ae9d4d99943417837fcf4291ba6d87535394abe238068775f19348cd58f0
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, flagged by ML classifiers and ClamAV as malicious and phishing-related. It includes numerous links to external PDFs hosted on compromised or disposable domains, suggesting a link farm used to distribute malware or facilitate phishing. The embedded JavaScript likely serves to further the malicious intent, potentially by redirecting the user or downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7355

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 http://finalstage.biz/js/upload/files/93289856162.pdf In PDF document text
    • https://bimstudioinc.com/media/files/xigavebimo.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/80502518615.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/wesipisekarim.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/73889255991.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/95294548076.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/63244245920.pdfIn PDF document text
    • http://health-bridge.in/upload/file/vopigezuzamaludidad.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/pavozunupaxekosapadaxez.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/6606248858.pdfIn PDF document text
    • http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/28340838902.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/xozirutawugijakiwi.pdfIn PDF document text
    • https://aykutemlak.com/upload/ckfinder/files/13188871208.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd316b4ebb---41548322744.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ede42d8b2---tewukawifedoxipor.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/73185425213.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/89985339851.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613085240d473---xoxanalemoweb.pdfIn PDF document text
    • http://yalcinsezer.com/upload/ckfinder/files/72129710110.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210909_62C6946FE4612F74.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/xotez.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/kolisu.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/65417544536.pdfIn PDF document text
    • http://wxdyzs.com/userfiles/files/nibiboxazalo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=arc+calculation+formulaPDF link annotation

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