Malicious PDF — malware analysis report

Static analysis result for SHA-256 d088186dbd255ba3…

MALICIOUS

PDF

83.6 KB Created: 2021-09-18 03:17:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b401c5184c7bbe519e078507f70773a7 SHA-1: d346450a271fcf5bb27cc5de59acd0b10e452b23 SHA-256: d088186dbd255ba38b4c8a848d50cd554ffc85d989c7c23373d977add355113f
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users to malicious content. The ML classifier also flagged this PDF as malicious. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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://krisoc.ru/uplcv?utm_term=aplicativo+para+foto+3x4+android PDF link annotation
    • http://jobsandhi.com/uploaded_files/userfiles/files/12131534458.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/jijosidize.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/fesovavigijifijopitenetu.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/81111999588.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/gebofarewu.pdfIn PDF document text
    • http://molenat-energies.fr/molenat.com/images/editor/file/11922989918.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/jasaso.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/40055923682.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16144c1cbd1967---34412892392.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/upljopca1u1ticaa7oae6h35m7/muxutuligalijesej.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356cf25a208---tatofebasidaloda.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/99131506338.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/62213685063.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/56778001393.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/23397324124.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/zugokegarenemum.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/94387632836.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/tk0rrfio0fablj2vrdb8901qo4/21191919057.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/73872672413.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/kimibuvoxewipodi.pdfIn PDF document text
    • https://babamansurkurhuseyin.com/uni/yuklemeler/file/zivenikizofubekalirinof.pdfIn PDF document text
    • https://kratky.eu/files/file/vamopix.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/19439077574.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/5401712697.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_off0000dfa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA8 18776 bytes
SHA-256: 1e341a925c35e80f7f0d1610af0c1bccf7f01861e29c34bcf5ae4a91fa86e733
font_01_sfnt_off0001102d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102D 10712 bytes
SHA-256: 841245b1aea8022eadd547e3825ce3f84a532b7b360fcb6f734ed69d17e8f9c9
font_02_sfnt_off0001290c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1290C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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