Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fbafb4c239083c6…

MALICIOUS

PDF

69.4 KB Created: 2021-09-25 23:10:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 84d91da1466ce4f97466d2f7728d03f1 SHA-1: eebb3dc5cb0f1eb440809c66ca5299014eb8c03a SHA-256: 2fbafb4c239083c6081a026aa49ba600312cf68211fd63e3d3bbdde2953d0b41
164 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. Heuristics indicate this is a link farm designed to redirect users, with ClamAV identifying it as a phishing trojan. The ML classifier also strongly flagged this PDF as malicious. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://www.msjcongregation.org/www/js/ckfinder/userfiles/files/12488009805.pdf In PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/12445407427.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/26553972701.pdfIn PDF document text
    • http://oodow.cn/upload/file/210916055445553900ahpw46rf2xyf.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/janoxis.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16149aa6904e32---lurixeroloxabegu.pdfIn PDF document text
    • http://xfswchem.com/upload/files/modosudigezile.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/tonewuleba.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/zinekotasoboxuxanereval.pdfIn PDF document text
    • https://shirbandifelt.com/userfiles/file/wumilimukoribeserib.pdfIn PDF document text
    • http://519pf.com/userfiles/files/luwetofesojerufogamovugi.pdfIn PDF document text
    • https://zakazspbwatches.ru/upload/files/5216713017.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/46254788171.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/bilejitidupunud.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/ravifuxakevotofibodusara.pdfIn PDF document text
    • https://coluer.ir/documents/file/zodivokoruw.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1c9e1bcbf---putuvuwarek.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/13467716343.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16146d07b6d53c---32590759349.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/7b6d959a39a32fe9472dc721c37dd4bb/10399920552.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/23507180234.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/30657228487.pdfIn PDF document text
    • http://wohntraumgmbh.at/vimorifonetodozegesof.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/79065131227.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=pixel+car+racer+unlimited+iosPDF 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_off0000af2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF2D 10732 bytes
SHA-256: 8b2b7898982e23c67f64f76d81b63d750a801bf730ec6c876af5f53380147cfd
font_01_sfnt_off0000c7d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D9 16000 bytes
SHA-256: 4407a9846b4769b2d9fa6175827fb1cbd8dc76adf7bf12e784b55be0f980b183
font_02_sfnt_off0000f05a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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