Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebc1c2c6cfd7b007…

MALICIOUS

PDF

94.8 KB Created: 2021-08-11 16:24:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 97ee9625fe91e568902f0f5dc58d4be3 SHA-1: a2af41c72f0f7342ccd2af995432c1484af875be SHA-256: ebc1c2c6cfd7b007a55d36c407cebe7be9157f4e37dbb21bca17c7817b242678
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://falconltd.pl/cache/file/75336994227.pdf In PDF document text
    • http://nhasachthunam.com/upload/files/35386813268.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/ruwomilikaginagi.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/4a80632fc0f7cc13ce18d0727fac02d4/nanetubewubelogaf.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/20809506966.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/lepufujujirigu.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/muresaludejenesodafeke.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/35300059616.pdfIn PDF document text
    • http://cpils.com/userfiles/file/vikokovo.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/qt4bjht7v1nbulki3ta99embaf/98793054582.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4feb827d32---vexajokumedulozoz.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ee2586a8396---jimesujobugikawu.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c494b3e83a6---7215576163.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc853ed318---13328016734.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/99795867899.pdfIn PDF document text
    • http://geose.ru/userfiles/file/vuxofomonifijunasiwanut.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/37284350616.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608661440b2ce---12953455952.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/sobufojuvitoxekuf.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610046acd1e67---voxifisixiwuw.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbcf9cb09c---28671453523.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f31bbb2d0---wefarobonu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=leather+tote+bag+pattern+pdf+freePDF 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_off00010d8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8C 17500 bytes
SHA-256: 2086aee843b23a55e0db9e5a0f7e2cb9eac8fc127a663fa3314dd7b27c474cf3
font_01_sfnt_off00013ba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA1 10568 bytes
SHA-256: 43b6094625119f5d1c9b586b9c801e2785e1e55f859de4767d1ed069828be78a
font_02_sfnt_off00015332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15332 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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