Malicious PDF — malware analysis report

Static analysis result for SHA-256 b66ae37611a96914…

MALICIOUS

PDF

129.5 KB Created: 2021-07-18 08:41:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f2e90612574a61110cd226c4813d3823 SHA-1: 511245f933f3185432d7d20794ba70c23117fc4e SHA-256: b66ae37611a969145074ba8d164babe100eea3c29e25ec03d2f39f27e05723cb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a large number of external links, many pointing to compromised CMS uploads or disposable hosting, suggests the document is designed to lure users to malicious websites. The primary attack pattern involves leveraging these links and potentially the embedded script to deliver a secondary payload or redirect to phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/ogftdktam8thpb1lncdg2sucog/3985839531.pdf In PDF document text
    • http://unseretochter.com/images/file/37565009666.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/dilaretuxedewututeveto.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/42538656024.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609619ba49a54---pafusowokogodifumu.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/wabumunowupuxa.pdfIn PDF document text
    • https://themis-lex.com/userfiles/files/48257562806.pdfIn PDF document text
    • https://geniodelweb.com/file/99121469600.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/9582903967.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/1faiaqjbda5sd6i7skg1ff5k7n/vavat.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210712221359_18310287.pdfIn PDF document text
    • https://rockdental.co.uk/wp-content/plugins/super-forms/uploads/php/files/3905a4514c6af7ce902e1533a0ba8f4f/50735864737.pdfIn PDF document text
    • https://petala.gr/userfiles/file/66595072625.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/lusazituzebek.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609439e4e40a4---97500102258.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/q4c1t73dlf8l9f2fpp3tinrbso/2660023114.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/gifodi.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160801e1638893---vizasa.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/8040758f9e21db23dbfe1ea85f4815c8/gisoz.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160860efc4477f---zoledezupejezelukipife.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/mawoporiwowikage.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/d673b6629fbd6b0ceda43c5f2a3d960d/vujanokuvuvesilekapem.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/falexuvon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=starting+prayer+for+bible+studyPDF 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_off000196e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x196E3 18096 bytes
SHA-256: ca2ae11e6198c7a3f562b08d86ceec9438ff3811f8763c5e2e6a277b05f6142d
font_01_sfnt_off0001c6dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C6DD 11100 bytes
SHA-256: 520ec7454f9b626ca11ed40b63e8bb715cdf89560a6f0f960dbff775c00ff73e
font_02_sfnt_off0001e072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E072 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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