Malicious PDF — malware analysis report

Static analysis result for SHA-256 1974c410a6ea4f5d…

MALICIOUS

PDF

84.4 KB Created: 2021-09-05 09:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4f2ea5622f541857ec723894a67298f7 SHA-1: 1070fdada7cc58c37a091fe72547a4f29a0642b7 SHA-256: 1974c410a6ea4f5d0d83cd9cac9c7952aaa7b5bd9a568789f7c4d7498876cc4a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the nature of the embedded links and the heuristic firings point towards a malicious document designed to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://ketchas.ru/uplcv?utm_term=biblioth%C3%A8que+%C3%A9lectronique+du+qu%C3%A9bec+pdf PDF link annotation
    • http://studiotecnicofrisoli.com/userfiles/files/98247654065.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/zesunanekotirubutesag.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160943420a7f6e---57775475868.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///monesowiwoxosu.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/57db8834325561e05eefc76e2ed98574/fanigedov.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/20352447154.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af929874a50---wupujulegajikekajekubux.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/27794105602.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/ad3s7l8rimere6f3o68706kdo0/nanef.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/pofapotugupawezemigasetoz.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160815fa6d29a8---kabogelemasozemujotifejal.pdfIn PDF document text
    • http://jhsclassof63.com/clients/c/c8/c8cc7cee7579ddcd469b669c0eb172d8/File/76046152327.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/kavikomerupopegisepiv.pdfIn PDF document text
    • http://classconnbio.com/img-jacson/files/82945080986.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/57894999839.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073e2aeb1d0b---80985427755.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160963c5681ae6---bogopixej.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents//files/85149688071.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/69363193865.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/milepagurinufivezesirib.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/17235493688.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/63439101264.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609aef8b00dcd---tojegopanafi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F5 22552 bytes
SHA-256: 17e6a76bba9609a0f763275dc143aa606973ba2f30eb3f5d89f5ff2f7726ec64
font_01_sfnt_off0000fabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D5 11136 bytes
SHA-256: 1f9b1ff91cef75d8c6afe7217ef8880522b924037f72b9efa79502b0110fa84e
font_03_sfnt_off00012b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B93 16244 bytes
SHA-256: fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d

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