Malicious PDF — malware analysis report

Static analysis result for SHA-256 eccc8a28e29c799b…

MALICIOUS

PDF

83.8 KB Created: 2021-09-01 15:55:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e23707ce5317534d86eebc86a52ec6c4 SHA-1: 9e5c263411b882b47323a848069497e1a5fc3058 SHA-256: eccc8a28e29c799b1437f9b3bce8484c8826a514b9c978f3b3a827e3d997f9a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress installations used for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160be8c8cc9f9a---sulixosidakidevepa.pdf In PDF document text
    • http://pascalparrot.com/uploads/assets/file/wafofoxenofatu.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/da992a03050f9a0967d1ede4c863b59c/sekokigirefoxisasoveromu.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/76255862706.pdfIn PDF document text
    • http://keralajesuits.org/userfiles/file/78906564156.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/rifofuwejifulaxenipapo.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/sewubixeta.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/bugafipigipikuvumimekure.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160918b7386ab2---39405390995.pdfIn PDF document text
    • http://onellenorzes.com/uploads/files/pefumopaza.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9116750bea---bokazekoladu.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ac290b079---setenobadubirosepujofama.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/mowadubafaxasofelupakik.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c29721cd0da---85863066828.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/pudasab.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/78558127424.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/787fa67e647053f54afe5e377b7ecebe/16293332509.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/zuwotet.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/8fb12bfa58aca535e9937bb4321b22d2/nakiratoxixef.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/3182549419.pdfIn PDF document text
    • http://polkovnik.su/upload/file/49990113536.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a68dd907f86---rapevit.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f6a14413f11---demid.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/t5rq9a68v579fnmgr9f1c4pc9o/samuvixorikosogo.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/51711681674.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210724130117.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=writing+expressions+and+equations+worksheetPDF 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_off0000df4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75D 18452 bytes
SHA-256: db2b09ce501a7b38ef500eef0a79b2b1bcbf56cef2080a822b66a42e07c9aaae
font_02_sfnt_off0001272c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272C 11144 bytes
SHA-256: 30955d0030877463e93125c0e50c26daf1589cf02e0b5e2a52575f32d9c495e0

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