Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5f02813732a34df…

MALICIOUS

PDF

92.9 KB Created: 2021-09-07 00:25:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d18c8e68c80d852b62ee7f4a3c7ab1d1 SHA-1: 9d593e61ce2e3c2ac8c18e595a6c6d19072c928c SHA-256: a5f02813732a34dfc6c3acb30412357531ecde92782643321eecbcfeed48552a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to websites hosted on compromised CMS platforms, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and numerous external links align with a link farm used to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://roweryelectra.eu/app/webroot/uploads/file/16225706825602.pdf In PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/b01fa6b2a4e0650286a2ea926bde0d6c/16740469556.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/54601791354.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/lb3mm3pv8f16mtt0husqpf0kau/8304502912.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/kimegejobi.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/vezodarodexojegobi.pdfIn PDF document text
    • http://sibservis.com/ckfinder/userfiles/files/16844612928.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f54de03b675---putimatorimek.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b9bdc9a86---74664657329.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/bufepuvake.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/62596886345.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/68349396740.pdfIn PDF document text
    • https://horgaszvelem.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/87696630626.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/92017691820.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/kugavisigogifu.pdfIn PDF document text
    • http://daiwavn.com/uploads/image/files/18446449785.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa846b71a82---vefuxesiluxerudir.pdfIn PDF document text
    • http://alternatifmedikal.com/img/userfiles/files/10097786039.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/65577401079.pdfIn PDF document text
    • http://lblussana.it/images/file/57461474551.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160b04f3bf38cb---ximuxobavifajarupizo.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160ed95817dc7b---mubikadijufatelujezevut.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/61556024725.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e560a2ac9---38950461753.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/jepamejotovuruw.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/402fd13318cc478ff192553526ad9fc8/35898673900.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/60058460287.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=prince2+themes+pdfPDF link annotation
    • 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_off0001044e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044E 10680 bytes
SHA-256: 5bd38d894d18dd148aa914275f94562f7405473e02610e8f3a48dba5d08b9256
font_01_sfnt_off00011c99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C99 18924 bytes
SHA-256: 7ec5e7238c02dd6b3dfeb3d3b52d767a8abfe0c79a8ff37a487e23cc70835c7a
font_02_sfnt_off00014dde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1