Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5aeb9a3179da4d0…

MALICIOUS

PDF

84.9 KB Created: 2021-06-26 18:58:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 877293e92d5bfe0dd55ca29cc50ee742 SHA-1: 0d67a0cc5427b5f395292b45a5df5621309509f5 SHA-256: c5aeb9a3179da4d004292b6e7efeeda213fdd4a4dd1d63a83cf7c6c68bc33cb4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external resources, many of which are hosted on compromised WordPress sites, suggesting a phishing or malware distribution attempt. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using such sites to host or redirect to malicious content. The ML classifier and ClamAV detection further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9830

Heuristics 6

  • 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.
  • 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://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a04717c0a67---17964765107.pdf In PDF document text
    • http://crescentcarpets.com/userfiles/file/76376322811.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16077b51fe8a80---31203841866.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609633c38ef8a---dunazerelagufeg.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/tokoxomitabawexelig.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/vubumuwafifuf.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/ostjm2u22d3surhb1s6h092bt1/luwifugabokakogalubi.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/lerotorupuniwubagipamoj.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/f6bb557d05e4b2dc5c195a9017f3652a/tujoxonegupugepavuxil.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/e78605ttesq9jig3gf55g0udnd/6245431130.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16082de7a82594---88828070805.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/e137ca52b4f219f6f72a207d0f245ffd/58277058264.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/4e769f63c53336ff9eece59ede166502/87376462282.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/lumopa.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/fibupomutosovotut.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bba879e32a1---16412829966.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/ec4a43d6d9b15fe2db7faf5129b2ac24/figenowuvujobojox.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/vazuseda.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/pozesijowo.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081da91788e4---dosipowi.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16091c27aa5143---61182570281.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/8dd84d1213b4612a9518ba98817895ea/dubelavopemevekeg.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/leweder.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/92993059186.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/nlsu877r6k5unie5ohuadij6pn/fivixajupaxavametoguvop.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/e93a6e8e67ada430dc45f40bf208464b/kinopojufozigibomiwevuxur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=picture+to+pdf+makerPDF 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_off0000e7a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBB 10656 bytes
SHA-256: 73de003f1bcefef996c4dbbbd16b89038414aa7cbf586f9a00879383d189c91c
font_02_sfnt_off00011834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11834 17612 bytes
SHA-256: cf48afd4e76000f337a9adab59d0ae42f238dcfd7464deb2e1052d4fe54307d7