Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5ebea034e72ae43…

MALICIOUS

PDF

76.5 KB Created: 2021-06-30 05:22:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c540cfdc72be82182aa5649e9a9fafe8 SHA-1: 554b5286386b1bba31d695321a1fcfeb9318ff35 SHA-256: c5ebea034e72ae431e586a84132f5fbac0367c8589659bae567db1a8265239c8
96 Risk Score

Malware Insights

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

The ML classifier strongly indicates maliciousness, supported by heuristics identifying the PDF as a link farm pointing to compromised CMS uploads and disposable hosting. The document's purpose appears to be directing users to external PDF files, likely for SEO spam or to distribute further malware. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://grandplaza.bg/uploads/assets/file/zijeliti.pdf In PDF document text
    • http://esthebel.de/userfiles/file/sumadopumemawutunogoweg.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/7e7f2ab6c3eb6147e1261512ec05ee0c/bugiwibugumavafu.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/detodawaj.pdfIn PDF document text
    • http://sweetbasketsbyjackie.com/clients/864293/File/welavuwowamalimopebu.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160be7a5605d52---wajurope.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/6dbe3077db338e8ef5ccad3bffca2a58/tevamunudiparuxosukotejez.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/qu4jrp2lcnv2nv96cb7l9c9ten/91428715443.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160791fb1a26e1---24208607275.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/24775534565.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/bafosibumugojufikexo.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f4a412140---fosanifoxefesogazutofarub.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/f5848d34c59c938295d77e58dac93dda/52808363098.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e9882365f---42076635489.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/216c2fdaef5bd27b4c9b0670bdc758d5/40922646080.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/momenelesunoputewov.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/71062366305.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/6f5868e7217e8eeedfb4bc05c8745a56/vikavunexoguzipiwexabebiw.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/lugokawukizi.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/37415009883.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/5a1a1224bf506ba8dc0bf3d7717c8708/40770922147.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=drivers+license+guidePDF 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_off0000cc5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC5A 16132 bytes
SHA-256: d36c03218d712d1feca2b0631216096c2b0b35397fc190239d60255d96b57fb0
font_01_sfnt_off0000f5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0C 10332 bytes
SHA-256: 89dfe79b533adf3fd061a682dea93bc7215761ff8ec31498ebf80c2e06195bf0

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