Malicious PDF — malware analysis report

Static analysis result for SHA-256 24de9073eca2991e…

MALICIOUS

PDF

79.5 KB Created: 2021-09-18 02:09:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3df8fbfeef5c3111ce67d749e8fb16a8 SHA-1: 978406fc1d84fe18fa7678a855e2f5f2483e1c6a SHA-256: 24de9073eca2991ec6b72eec0c3dee1eb5f81b3c07117d07379e1bc043ad0f0c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ketchas.ru/uplcv?utm_term=geometry+dash+apk+2.3 PDF link annotation
    • http://inphilong.com/upload/files/65268518981.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/14207029196.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/doludazivilok.pdfIn PDF document text
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/xizubexov.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/4946954516.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/5d89b2e8937f8f7f5a710e73ff75f9b3/gefisanaja.pdfIn PDF document text
    • http://ndt-ultratech.com/files/lekagozenunorezuni.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/71957505430.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/a140c71836799f9c3023b21212715148/fubejerijiwadi.pdfIn PDF document text
    • http://fluorescent-training.com/file/benurujozag.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/36845880654.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/14867225477.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/66013561712.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/78808798879.pdfIn PDF document text
    • https://latework.cz/soubory/28873689251.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/pikakiwebiwasebet.pdfIn PDF document text
    • https://viadagio.be/userfiles/file/kafufezebed.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/tadudugen.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/jopubogowujetogumera.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/79730712905.pdfIn PDF document text
    • http://fourfoods.com/images/files/mitesavujodowelebulogused.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/66413748650.pdfIn PDF document text
    • https://frontivo.ro/userfiles/file/2580961567.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/fff3449f3b098f6b5a9939a2783e71ee/96854310482.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_off0000d34c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34C 11020 bytes
SHA-256: 74a79ac3c679e64de4d5cbf44fa0150f4a135f3663f631e57e68709403eee21c
font_01_sfnt_off0000ed18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED18 16924 bytes
SHA-256: 16ba55cfdee712ab5a9057c0dffa56166532e313f601fdcf1491f55c58e86faa
font_02_sfnt_off0001187c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1187C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1