Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd6bd25ef0023195…

MALICIOUS

PDF

78.9 KB Created: 2021-09-07 13:16:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 66be93fe8c75794574c538df333f09c7 SHA-1: 23a2f49a9f295b0e7fca6348b9886c7babf37ecd SHA-256: cd6bd25ef0023195906f68bc82d9f51a8dac4a9977dba429c778f20b5e7fddba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://huntic.ru/uplcv?utm_term=toyota+4runner+2005+owners+manual PDF link annotation
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/3b9d131315f1f08a3f583ee1be31bb9c/41774344197.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1fa528f60---tekalojatixidifusuxigunaf.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/8807014862.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/39298217944.pdfIn PDF document text
    • http://sehs67.com/clients/e/e0/e078d4d0076166a7bb489ca3b3a583ab/File/71886067522.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f553e960e2---81392241861.pdfIn PDF document text
    • http://sochistandart.com/ckfinder/userfiles/files/95705116700.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/nafuvap.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e68ddfb1a48---33174619346.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/50335027753.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e76bf7d191---sawenagetafoserizitajazug.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a4d8a2ad5---bajuxirifewaxunufutikukeb.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/84579355674.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160710a29e2aa6---mobodupefewigi.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/84893442064.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/taromefelibunam.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc1155f51d---juwuwabijuvobuta.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/om08fj8j67nul63mcpod8978ta/vijorokas.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/bozuvamevedezun.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f7fd2f775---guvesipedifivepexinab.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/f34f59feeab1abdd6cac74e781e0a37a/91115943074.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607193802f362---dititasixekikurixigi.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/59073653988.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF1B 10892 bytes
SHA-256: 3b32a94af9ba1cd3a0107f6c23d39c9317ec5d3941b7bb9ff623cfc7e06fdf87
font_01_sfnt_off0000e895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE895 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A7 17572 bytes
SHA-256: 9e3537a73320f188735da51133e234461526f7d75953e6504dcf3a99c1f8b841

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