Malicious PDF — malware analysis report

Static analysis result for SHA-256 1842f26d07cc8fe9…

MALICIOUS

PDF

76.1 KB Created: 2021-09-12 16:26:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ecf85fa9b2090e28c396252c1210bda7 SHA-1: 3f42552742fec17a8f0dc63a2e2d8a491d4c6916 SHA-256: 1842f26d07cc8fe9c36518e145c52f31cb127b97942c1aea64ede5f318d51a05
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7561

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://cameralehiep.com/hinhanh_fckeditor/file/30326204081.pdf In PDF document text
    • http://livestocktool.com/d/files/fojikukuded.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/65450118361.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/63109277177.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16134a7dcb9ef2---63309044532.pdfIn PDF document text
    • http://rkenterprisesonline.com/FCKeditor/file/1602953050.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/suputavuralonit.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/tabopojedamipi.pdfIn PDF document text
    • https://tmtteks.com/files/1634658184.pdfIn PDF document text
    • https://alident.centralcms.cloud/galeria/files/75472018705.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/detor.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ee382c8be---96773285923.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/63975741180.pdfIn PDF document text
    • http://kaies.net/upfiles/file/67335806362.pdfIn PDF document text
    • http://hnsunnyfood.com/d/files/kojilimifegato.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/74498055509.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/664d15ef6d2f4d21ff659556fd954451/97295527764.pdfIn PDF document text
    • http://vhktn.at/images/content/files/70359249951.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/dewejuzak.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/59864535354.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/pamogupipotitowoninijuv.pdfIn PDF document text
    • https://linker.tw/files/rupigegorijegitupexigule.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/48327552929.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=gta+san+andreas+ios+xbox+controllerPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80E 10644 bytes
SHA-256: fafb4dcf91b937eb6be32cd217205272f1ff9908e92c8aff07d982d2d038eede
font_01_sfnt_off0000f090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF090 17360 bytes
SHA-256: fc4718f35de6b7c00743b2fb93f3fd60ce54c4ebf3a4d091e456483eff8ababf

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