Malicious PDF — malware analysis report

Static analysis result for SHA-256 52c0354e8ba77238…

MALICIOUS

PDF

77.6 KB Created: 2021-10-10 03:59:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b7acce53e5013668efe43faa580802f5 SHA-1: 2eeb209b2abd20b9eacb2c5d131d19be12ea81ae SHA-256: 52c0354e8ba772385ab2d20133d0d85eaec411d4e44b14619042d7cccbdb9eaf
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected by ClamAV as Pdf.Phishing.Trojan. Static analysis revealed multiple heuristics indicating the PDF is a link farm, with many URLs pointing to potentially compromised WordPress upload directories and disposable hosting. The document body is heavily obfuscated and unreadable, suggesting it's not intended for direct user interaction but rather to host links. The presence of numerous external URIs and the link farm structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2855

Heuristics 5

  • 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
  • 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 http://mfcpavpos.ru/file/dokazaris.pdf In PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/36086793630.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/69889965619.pdfIn PDF document text
    • http://nprofit.hk/userfiles/76394133280.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/xirazekukagisoxotupowex.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/b5cdd135a0070adb341a3f9f4bec4375/zajoratililapapizo.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/miberigabodenebepidefaj.pdfIn PDF document text
    • http://nirmalamathachurch.org/cms_uploads/image/file/39597979109.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/88261997966.pdfIn PDF document text
    • http://foodchemsino.com/d/files/natoji.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210916104518_yndupe.pdfIn PDF document text
    • http://vidol.eu/userfiles/file/83895580928.pdfIn PDF document text
    • http://china-miyaco.com/img/file/202191951537.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161541956b2963---zodawijojagur.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/fesisi.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/modol.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/tuguwefire.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0405e9d76---rumufebe.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/dujilikelimaxogoguposimo.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/takizodezanijoj.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/09bbe33d65f9f01ae41068cc6b3f6786/87702246861.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/24353934009.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/bitejelukutovatowabafigiv.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/80377090837.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/fanavufiniwi.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/malogaduboxajipemew.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/33842221529.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=the+art+of+game+design+a+book+of+lenses+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8F 11140 bytes
SHA-256: 197ddb38d82336e7138ae8464f6350e84940651349f6331cf43e5044e89eb1bf
font_01_sfnt_off0000f8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F1 20728 bytes
SHA-256: d0bade394743a0a17e8ee4ff9ea41bb0faed4aa00c5471a73ba8a257ec18a4b5