Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b68d95e8067151f…

MALICIOUS

PDF

84.1 KB Created: 2021-09-08 10:38:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 146d418078e421bf9a90e31099419625 SHA-1: e21d03e23cd9ffe63a913e3c222083fcc29e2ee8 SHA-256: 0b68d95e8067151f68eee334f6de7a5707a7452da4bbc2b69ed42fa1b35a98aa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or exploitation process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://inwebjor.ru/uplcv?utm_term=plantas+vs+zombies+para+colorear+pdf PDF link annotation
    • https://thebillionbottom.com/business_school/uploads/file/vabubifuzabemizemoxef.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210717_656ADDB78FF6ABD9.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/99080020345.pdfIn PDF document text
    • http://sartor.ru/upload/files/55774355563.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/eaa32dbce246b18ee5c3d115aae0ddaa/varegeto.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/af8d10b45df2ab9d7c67e760d806cbfa/widerikemalofuv.pdfIn PDF document text
    • https://sealskinz.ru/files/file/jilidowutoweposodevova.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/58958540670.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f34e1a756e---28792213548.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ce1712591---zoxuwazilitovefimotigi.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/80922087693.pdfIn PDF document text
    • http://gdbchurch.com/clients/43262/File/44536472821.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/23433541012.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/4kpal46jrrn55htk75i0uas2gm/xilobixogi.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/98345210491.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/gawitinikupar.pdfIn PDF document text
    • http://protetyka-lublin.com/images/wyswig_images/file/tuvaveko.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/651490e9ca77b8573071e9fd5d42343d/59088416331.pdfIn PDF document text
    • http://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/galur.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e28d81ac1c---37741699976.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/a9ed17971fed73d5517bdf52af8a80b0/92060270929.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/tukazuve.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/83129493912.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/7c0ec9bfa6aaaaf38ac8ffe410f4f083/55301215689.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ded6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E8 19432 bytes
SHA-256: 453d4bb0e54fa27be3f6e85ee6d5ded351cb998333afdd6184de9ceecb31a215
font_02_sfnt_off00012906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12906 11048 bytes
SHA-256: a57e288c1c2c225c6e7c1e752c8fe957bb3d202489b78a6205a0357b388cbb9b

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