Malicious PDF — malware analysis report

Static analysis result for SHA-256 60f826b54eaf5d89…

MALICIOUS

PDF

83.1 KB Created: 2021-09-01 18:16:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9c6950f71adc5d76a7aa29077eb3e0c4 SHA-1: 4e2b65c336993ddd5fadf262606685e512f308a7 SHA-256: 60f826b54eaf5d8961b45cbecc338722db41be0b85a63d29b421909afaddd827
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612acd724a561---nadogagorifazefulumavome.pdf In PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/59c5d9dd281ae9d44b600472edf45657/6809057303.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/29170747440.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/84787650831.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1606d471df285c---67714206936.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/43707868171.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/j9ofkh5lue9vr1e8mhac3e28a6/85825856647.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcb5d960723---92881539694.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca20767f66---76425120529.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b1a5ea061---41586262555.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/dowamu.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d01f6e048---18226647347.pdfIn PDF document text
    • http://xinyuemu.net/assets/202107/files/20210722191410305844.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/cdd6139bab1561076d1778b7975e27ce/62770393083.pdfIn PDF document text
    • http://juncheng.tw/upload/files/fubijanewefofu.pdfIn PDF document text
    • https://ikima.fr/uploads/file/voxogomematada.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d3be69eff---dilojan.pdfIn PDF document text
    • http://edison76.com/clients/5/54/54c13950cbd15a81e6fb4362eab8f273/File/6255493946.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/vuwikaxoruwalexipuveran.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/k2mueuhubgdpb99qsldv2uc3v4/tavopagadajola.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/547751eb01a3345709741ab950ad974b/befizowa.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/99962303702.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/ea81a8693e655804aa05c3f6841f4036/lisebidokijezupulel.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/xovefebimanonub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=training+and+development+process+in+hrm+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_off0000df96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A8 17208 bytes
SHA-256: 96b525f4d42c50febc1d643eb212035be29a9041565b4346ae2c12bd6cb8578e
font_02_sfnt_off00012444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12444 11096 bytes
SHA-256: a525fbbe301b5a2710be4545cbcea05c3456934ef068dc09727b860ce659aa14