Malicious PDF — malware analysis report

Static analysis result for SHA-256 f51e30f8912c1287…

MALICIOUS

PDF

75.1 KB Created: 2021-09-18 21:10:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: e15ff2d22b7ac6338d853646a2d760a9 SHA-1: 397a4ef636b8366ecc9386a68b20b302e242d5c9 SHA-256: f51e30f8912c12874dd24bb288e5641126ffdeed9e1cec4a3a29e9dc0ba29f93
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 CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection or further payload delivery, while the link farm serves as a lure for users to click on potentially malicious content.

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 https://selapro.com.au/application/third_party/ckfinder/userfiles/files/80432321110.pdf In PDF document text
    • https://www.hemingway.bg/app/templates/js/ckfinder/userfiles/files/83250312173.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/wodikirunifadivo.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/73650902190.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/41852791805.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210903_042715.pdfIn PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/63848150531.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/likimu.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/wobojidadu.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/pifezafakelepo.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/71365364011.pdfIn PDF document text
    • https://lrdreamteam.com/files/files/file/InfoProduct/file/poniz.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/13097ffc1a4d4ed6c91ec64fa2bd7854/xumen.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/rogogifudolaganafeg.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210904_175444.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/66306515819.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/bogusajobisenerug.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/4vbm929fj6eji7iv8vdpm81u2m/81434102413.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1614220d3c34ee---19907578150.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/gesijarejuxipaxipidejilim.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/c7db6750ed03df63cee3e66087ff63f8/xenidefujinusoferorepulis.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/mozabetubedufuvirukolox.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/76784729146.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=position+vs+time+graph+to+velocityPDF 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_off0000ee9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B4 11000 bytes
SHA-256: 4aa1e945e9a81991c782d06ec96a5a3b543a903887aa194e7b10842be5814e42

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