Malicious PDF — malware analysis report

Static analysis result for SHA-256 dde81a59ae150ce7…

MALICIOUS

PDF

77.0 KB Created: 2021-09-05 03:17:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: bb80e64fe714972a3724f25aab1bf19d SHA-1: 2f1d22fff65b1e8ef412c74f0aa618e5212acaa8 SHA-256: dde81a59ae150ce7c9b2f5d2cc64a696882ca2db1c85cf3ccdd336dad61982db
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://crewmak.ru/uplcv?utm_term=coby+40+inch+tv+manual PDF link annotation
    • https://debcopharma.com/userfiles/file/joxosazewomurevog.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/90192764296.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160c55160c364a---30199074806.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0d8a8ce42---wosokunikogowutemuni.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/39378945745.pdfIn PDF document text
    • http://bamila.vn/luutru/files/87925588820.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/kabuk.pdfIn PDF document text
    • https://advik.net/userfiles/file/34547908644.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be89f64af9---pusil.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/53fc0fcbebca038d1040f0b645e5a16f/81748336821.pdfIn PDF document text
    • http://nktrading.qa/file/files/gamowiwabepatinuxutapij.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/lomojefotuvam.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/lusis.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/napifiku.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/839b561273a7af186785fb5fad078780/23453456799.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/c704faf240f6facc3cd71a8906fc76eb/53176985189.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610618db49a03---pidoxilileziri.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/zadolikodavojojetetu.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xinaz.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/a77b89b2b4995a0a818cd70fcacc85b7/dakejojarizenunositabiram.pdfIn PDF document text
    • https://gazelletr.com/userfiles/files/tunovixijoseta.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/mazomadel.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202106/file/bamatuvewitunolo.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_off0000cac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC8 10748 bytes
SHA-256: 0d28f8c900b55930b18416438024e8009a2bf264d7be49551bd57db427157af8
font_01_sfnt_off0000e35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB71 16596 bytes
SHA-256: 1fa9dc3abc664f8a62b4273ce49093eeacee7dc7dcfea89cf7c7cc9562b96c05

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