Malicious PDF — malware analysis report

Static analysis result for SHA-256 06cff8d7e5002383…

MALICIOUS

PDF

87.3 KB Created: 2021-09-15 15:20:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cf47d7352a1796819854b85f0dfc440f SHA-1: edb92e3f8c7efc21036f0f0c0aaacf3d75d4318e SHA-256: 06cff8d7e50023830b52101e3220d3b7c921afbedff990ec53f15ca27b66f2bc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript and a significant number of external links. Several heuristics indicate that these links form a link farm pointing to compromised CMS uploads, suggesting an attempt to host malicious content or redirect users. The embedded JavaScript, while not directly analyzed for specific actions, is a common vector for exploitation in PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • 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://icnj.net/ckeditor/ckfinder/userfiles/files/witebijegajeme.pdf In PDF document text
    • http://sl-light.ru/design/img/upload/file/5379079869.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/nofida.pdfIn PDF document text
    • https://onlinendttraining.net/files/51838982923.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/mulikubulafodumepap.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/wanexizusazuv.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/26816529530.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132aa1a33ba9---34372019621.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/jogalari.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/98068135446.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/zidimovixiwelimopetan.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135d5186bf47---tesuko.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/fuxut.pdfIn PDF document text
    • http://gomsuhoangminh.com/app/webroot/uploads/files/77113496739.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/40189589573.pdfIn PDF document text
    • http://kco.su/userfiles/file/wajoxefufa.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419ac3db7da---18562483993.pdfIn PDF document text
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/2857793081.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5f772fe4e---relopawi.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/72273215133.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/80890573776.pdfIn PDF document text
    • http://seamacros.com/upload/file/povizesuwajapiperig.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1a614293e---polamowavorozefixuzuvawet.pdfIn PDF document text
    • http://tongrentangthai.com/UserFiles/file/80606466537.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613284543dc1e---bipoz.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/dusamivudesumuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=starts+with+e+and+ends+with+ePDF link annotation
    • 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_off0000f053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF053 10340 bytes
SHA-256: 31d9503aed047600da3ffcaca8c32c04537ee2d1b047f36c0fa7fb8735a057cb
font_01_sfnt_off000107a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB4 18000 bytes
SHA-256: f823769c06627a70d5c56b17ea8b194c48d7dcf9694a915e2e88341fbf767e2c

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