Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f69b1efb68a127b…

MALICIOUS

PDF

78.8 KB Created: 2021-09-17 06:59:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8cd4b4b2f713fdf3155aa60954595e38 SHA-1: eb898d609a7b989466d2bf7c04d384dac3153cc4 SHA-256: 4f69b1efb68a127b73e82054c22c276e8e5171ee9ddb1ecd786ff427ee3ba033
196 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, and heuristics indicate it is a link farm and a browser extension installation lure. The document body is heavily obfuscated, but the presence of embedded URLs and the heuristic firings strongly suggest a social engineering attack aimed at tricking the user into downloading and executing further malicious content, likely via a compromised WordPress plugin.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • 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://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f827a77966---venipa.pdf In PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/6cae2d8aaff67e35bdfc7144b72da8bc/13577594053.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce802726de---linip.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161354b5e54518---xusexokubudebosewipazekuk.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/38f2d2d79d6d12bba754929051f76aed/mizofaziwefolixetukekaf.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/lafomapuresafefipawexezet.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/67450300164.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/41432636478.pdfIn PDF document text
    • https://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/52646293128.pdfIn PDF document text
    • http://zubrcup.by/files/files/9245832789.pdfIn PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/jifogiwaxesojowakejaxoj.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/nuxorevirinupuzaturi.pdfIn PDF document text
    • https://ganganagardentist.com/userfiles/file/jibulurusatubetijasate.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/42574562882.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/3e92e17dd755ebb49ade305523d621fb/88296823157.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/lolan.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3859246c1---jepobafagekuzefesipoge.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/90164556645.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021091710290573499.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/60977678944.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/78080480593.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/9296847674.pdfIn PDF document text
    • https://latework.cz/soubory/50848977843.pdfIn PDF document text
    • https://theipbuzz.com/images/file/40244920079.pdfIn PDF document text
    • http://webspace.mysdam.net/images/newsletter/files/ralapokimudibipezejaba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=phone+apps+to+watch+movies+with+friendsPDF 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_off0000cfd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD0 16904 bytes
SHA-256: 66220fdb7cd4b58ec84aaca2d73676965170859845c0841ca4e37a4dcebbe25a
font_01_sfnt_off0000fb95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB95 10992 bytes
SHA-256: 8e897d5ad78ae4e56f1a25b34493aa63a81685f74855e9be89f2506f0206f26c
font_02_sfnt_off00011500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11500 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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