Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0fea7241b2053c7…

MALICIOUS

PDF

66.4 KB Created: 2021-09-17 18:29:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d182366159ece257a09751f0ff454581 SHA-1: 50b4a1d081fa8dff94cf05ad2bc1c4ca862624db SHA-256: d0fea7241b2053c77908395ca3d0883c87f5884a3bd2e79947544e7407b008aa
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file that contains a link farm, directing users to download other PDF files. Several heuristics indicate that these links are hosted on compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the presence of numerous external links points to a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9158

Heuristics 5

  • 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.
  • 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://inannamsao.com/uploads/files/73106913486.pdf In PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/161441f93408a6---vuxuvisuwizujuvobove.pdfIn PDF document text
    • http://ihanzao.com/userfiles/file/20210904215626_1719881545.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/33186690845.pdfIn PDF document text
    • https://123natura.com/stockages/files/40550193530.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/kuwule.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/99739893952.pdfIn PDF document text
    • http://wajl.net/img/file/202191011354.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/1lge56jivic86641bgdl9j0g20/15112551479.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/joxunenebojizazajo.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/c3542cc294774d76e1c581f683acc16e/94449004583.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/betigejuxavafolufe.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/af76e181d40f2ce353bea41659d6a6c8/vipizemifulikit.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/xajuwiwafezolidux.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/binevikudominadaw.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/bizesag.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/29030050371.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/walunowesuguj.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/c9pk33qmresedb8nlorq6ptr0g/96742340111.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/89574977606.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/ropudumilizu.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/80145972056.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137c2ed5120f---mobikamanalaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=download+rugby+nations+19PDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000defe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFE 10952 bytes
SHA-256: d82784c63b6217dc1f71f810b766cf54ddd9f949ddf3adac31b99931a2fa198b

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