Malicious PDF — malware analysis report

Static analysis result for SHA-256 29f22f49d3e7056d…

MALICIOUS

PDF

79.2 KB Created: 2021-07-29 20:10:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 62c560aba4244b3a29ea298732984dc5 SHA-1: e38323e018f0fdb0dc1666f2854178a469890110 SHA-256: 29f22f49d3e7056de2abec12abe3b97ff2972b4781cf66308048b6cb43623d7a
96 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to distribute malicious files. The ML classifier strongly indicated maliciousness, and the presence of numerous external URIs, many hosted on potentially disposable domains or compromised CMS uploads, supports this. No scripts were extracted, but the overall structure indicates a lure for users to download further content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 5

  • 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://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec4147033c---97436162200.pdf In PDF document text
    • http://xn----8sbosgn1al9i.xn--p1ai/ckfinder/userfiles/files/89885985205.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/94070382661.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/savedekik.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/23371510228.pdfIn PDF document text
    • http://renovator.cz/files/file/64225862069.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210511125721.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160758bbe371b9---mazelutululadibuzudo.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec21bafe51---birunaxogobibonimazixi.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/thpjrr8aprqsr1b6unds8agov3/gadezofupekerezifun.pdfIn PDF document text
    • https://bioesteticaonline.it/file/jagumalezebezagar.pdfIn PDF document text
    • https://service-panev.com/userfiles/30783153978.pdfIn PDF document text
    • http://jentretiens.ch/uploadimage/72187082464.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f472bd04c---95100499094.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/25816969108.pdfIn PDF document text
    • http://fruitvita.com/files/files/lamakejiraz.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/nbr65oqa1e37crmbdj05p86m75/somamukomukawenojidolas.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608548358590d---vetasotixofenuxibu.pdfIn PDF document text
    • https://mimpi1pusat.com/contents//files/pusivalamigimolen.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac10ae4c77e---gisawepafovapido.pdfIn PDF document text
    • http://varanini.pl/userfiles/file/vozuralododomotebodabe.pdfIn PDF document text
    • https://termokingbt.com/ckfinder/userfiles/files/27259068341.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/29108405718.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/84842258318.pdfIn PDF document text
    • http://mobilephleb.com/clients/2/2d/2d2188d13063160162e6e2bbcdac547d/File/razim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=the+sims+freeplay+dinheiro+infinito+apk+atualizado+2020PDF 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_off0000cba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA1 19528 bytes
SHA-256: 8f7ae2fc5c57f743654b9308a134591cb9d285ab1fb21a1893a8105375b52e55
font_01_sfnt_off0000fb4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11364 11332 bytes
SHA-256: 60585cef3af7020b11523cd99b86bcc93164245a29563b5216de56b1d3d1bcd2

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