Malicious PDF — malware analysis report

Static analysis result for SHA-256 25ab4d9c1a72ec72…

MALICIOUS

PDF

89.8 KB Created: 2021-09-22 13:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 428106005e668c70dfefc08e7a461bfd SHA-1: deade16381fd295740cb8e97161ff25a32da9c90 SHA-256: 25ab4d9c1a72ec7205af52a358a0f9097b7ca03e2dbd39289aec19da1da2e769
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. The file's structure as a link farm is a common tactic for distributing malicious content or redirecting users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://coretry.ru/uplcv?utm_term=rue+dies+hunger+games PDF link annotation
    • http://lamorenj.com/userfiles/files/zuvopujepogewabafoposekox.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/givijosagubijevededap.pdfIn PDF document text
    • https://transdeliveris.lt/userfiles/file/77724776583.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161421c0e25978---lanubukisabenewugipedas.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/53802431879.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210916055245.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/f2e15c2324d9a5413d239ff48c6aacb1/33612942320.pdfIn PDF document text
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/fiwurutol.pdfIn PDF document text
    • http://k9careclinic.in/ckeditor/ckfinder/userfiles/files/923490751.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/lafiditudasidom.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/9a485ef0f6bca3881ab2a32c30a7718e/81100083905.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/f66bcd49d1f30ce45bd1d474803c7ae7/78526667378.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614828d0e37f6---6653948849.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/80504075565.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/63744536321.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16142778d06944---30441679734.pdfIn PDF document text
    • http://thucancakoihikari.com/luutru/files/rudoxuguxomosovukes.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/4dmm2stv2ksskrmpk38av9cbuf/99508489371.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/nesuwunapoduneredog.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/13314921078.pdfIn PDF document text
    • https://performanshost.com/calisma2/files/uploads/89917544438.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/91559597220.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/70719790561.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/36791707758.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/42171885356.pdfIn PDF document text
    • http://manegedebuitenwijck.nl/uploads/file/difufavaniv.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_off0001009d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009D 10576 bytes
SHA-256: 24ba795ba2a2b21dd5657c56cb62b4ec83b6155238bc0e8951f73b41c69a32c7
font_01_sfnt_off00011848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11848 16160 bytes
SHA-256: 739958e3376ac219d7440a945b16d8aef5f3d5ea3af7f659741ef935ed77a1a1
font_02_sfnt_off00014194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14194 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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