Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd9087f93defb3da…

MALICIOUS

PDF

279.3 KB Created: 2021-07-20 17:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 3342b7f8237b50a04b0d81c0e49b800e SHA-1: a268113598fdd0b548c0d2c00a58aa8d3900ad2c SHA-256: cd9087f93defb3da61970df23c7b16b44bb4c08c192910fc9c8701311f617593
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including ML classification and ClamAV detection. It contains a link farm and an SEO redirector, indicating a phishing lure designed to trick users into downloading further malicious content. The presence of external URIs and a compromised CMS upload link farm suggests an attempt to host and distribute malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9766

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/83594960655.pdf In PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/rbkuj8dovjv9nijhc4japla29s/gosezanulugizapaxurid.pdfIn PDF document text
    • http://emeraldoutback.com/clients/f/f6/f61299a274fa8fdb0c00f5b1ed511d42/File/83815398091.pdfIn PDF document text
    • https://mayurherbal.com/userfiles/file/88920469221.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/7432082614.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/lunubi.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/newuzemoledof.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/bapadu.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a393ca0e490---jurajalopaji.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//busujixawutarakisenozexos.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kekumasoxefunezukusa.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/67464287162.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/h2me8s3slk9cqb175auii4k5ev/90790637268.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/fd406fc2dec9593063ca35f6917d5f91/ditodupun.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/jawuwisudox.pdfIn PDF document text
    • http://pvvc.cz/files/lowesarimeb.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/88927049357.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/88420438564.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/1759401663.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/gmfq5h09v56qmkegejqk339c33/wofotajavi.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/54900de463b5b85bd395eb7c9b8a5d7b/74233734922.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/3431135118.pdfIn PDF document text
    • http://photou.cc//ckfinder/userfiles/files/33832534248.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/81962981153.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160be0f648b368---ruwegamuvelakapubatifow.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/18b7aa789ee67186e5866b963e5d83fd/30097936068.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=ron+and+hermione+deathly+hallowsPDF 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_off0003edb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3EDB6 18268 bytes
SHA-256: 61f451551cee735f231d7d05b99d459ebcf7bd3a1bfd80a8743c2729ee1e7b77
font_01_sfnt_off00041db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x41DB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000435cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x435CB 10756 bytes
SHA-256: a01c52ad73e39c559dcc90be7ad47bbf7500b0670179d22d07e07d2a8f6c4119