Malicious PDF — malware analysis report

Static analysis result for SHA-256 41e47f90e03cd628…

MALICIOUS

PDF

70.6 KB Created: 2021-09-07 00:10:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f411e1c28db2efb7a79b7874c2df9ddf SHA-1: ba8c061c6b306a6e9fcfe4e57d68483082ecf7aa SHA-256: 41e47f90e03cd628f22b59010b947214a02f6bcdab0eec5e347050b7b9809736
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious content. While no scripts were explicitly extracted, the nature of the embedded URLs and the 'link farm' heuristic indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://widepolymers.com/userfiles/file/maxovasapekezinumamib.pdf In PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/71d2f916decdd7c7ca02c2082c7984b0/14504863883.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608312c570755---lufejujuvabegagijuzulozu.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/2109679649.pdfIn PDF document text
    • http://ipublicity.cz/data/file/bawefaviwelaba.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/258139410d79c011ebefc489f2fc0814/jufutarumozojosuketati.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/lejasarizujasef.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/wovuxulikalojow.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16097e41ebd8be---97905506822.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/f73d23ec23c978d51fa7b27186b16c6b/64015040736.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/nokiwutexaw.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607543754eded---gagejozaniz.pdfIn PDF document text
    • http://notarbrazda.cz/userfiles/file/xotomotatanuvex.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/c193892702934122effc81b5d9cb897a/mivutepezajevul.pdfIn PDF document text
    • http://hadt.vn/upload/files/76433424238.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/fuwivalabevef.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7ab0e2e22---kipagesukeladoketazevaxis.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/53564322205.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/galukej.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/65c8118072cf616051ca227a911b3b9c/9284157903.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/savigeliburepemuzogogozul.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a13934258---3305728581.pdfIn PDF document text
    • http://klpa.net/userData/board/file/makifikukur.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/wixejuz.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/ughfqeo3uis434g3pokus65u58/84963170861.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=autodesk+revit+2019+user+guide+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_off0000b624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB624 11064 bytes
SHA-256: 364ebee14d93fb55712deb95c28bbbcc9d01f90de6ea544818c58ef99ad4ab3c
font_01_sfnt_off0000cff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF6 14580 bytes
SHA-256: 78cbf568b98e8572c030b1d85ac9047384a9429a5a947c286f7f0a471d4dd84f
font_02_sfnt_off0000f3ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1