Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f15e3f6c8253443…

MALICIOUS

PDF

80.0 KB Created: 2021-10-05 14:25:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 3a643d4348c9c4d590dc4c1171c83673 SHA-1: 7469089205e03c6c8ccaa38a1819805142088884 SHA-256: 8f15e3f6c82534430d4283fed37797e0789bf8d56d908418dba85620641cd9b9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded links are indicative of a spearphishing attachment used to deliver a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8548

Heuristics 5

  • 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.
  • 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://wsystem.sk/userfiles/files/965947999.pdf In PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/87376715666.pdfIn PDF document text
    • http://rigdrilling.org/userfiles/file/10395694940.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/30365961996.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/35287421719.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393e959c574---58532089347.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/fidafigagefogijodipo.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/6419659916.pdfIn PDF document text
    • https://vietfun.com.vn/wp-content/plugins/super-forms/uploads/php/files/ham8o0ttu75mtl44hce64bvloa/51590991914.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/46357085861.pdfIn PDF document text
    • https://mollis.rs/files/66262198871.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/zumurabujosugug.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/7450563331.pdfIn PDF document text
    • http://tuivaivietnam.com/uploads/files/17209280835.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/efcdfe1313a466392d7a257cd69faa01/1329971972.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/95231525472.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/ramozemotuvomimugevisini.pdfIn PDF document text
    • https://www.anoregmt.org.br/ckeditor/ckfinder/userfiles/files/735047431.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/11027198944.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/28266829890.pdfIn PDF document text
    • https://s-oil.hoakhanh.vn/uploads/image/files/gidewaz.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/meloledada.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/gavidisopaxapilaf.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/56fe712c195c9e17ab96041c704c92f0/rajuredijip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=chennai+corporation+building+rules+1972+pdfPDF link annotation

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