Malicious PDF — malware analysis report

Static analysis result for SHA-256 de11dce9bba0caeb…

MALICIOUS

PDF

85.1 KB Created: 2021-09-14 13:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8a8728ca6769443387fb529998a816c7 SHA-1: 2914e04486e6c87884c54a22172bc2641d7a2a00 SHA-256: de11dce9bba0caeb023bd22254123f9ae0b4420993cfec6f75ed66a3cd76850e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such links for SEO manipulation or to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://pixomot.ru/uplcv?utm_term=cartoon+network+app PDF link annotation
    • https://camphacement.vn/upload/files/dofakepuxodegerulowa.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/44425915013.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/47586372765.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/dopk07qk2ab5klphmu1irpeno0/laguruj.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/35435988558.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/jogidagikidirolarufuwaf.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/nuzafipo.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/49875136134.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133678e7a665---volisogor.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/73510384579.pdfIn PDF document text
    • http://wajl.net/img/file/202197211959.pdfIn PDF document text
    • http://mzch.pl/userfiles/file/7238225495.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613174f598799---mesivojemuv.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/35583295586.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/gdmlnh0l6o8icikr08v55nvft4/xazokefizerotudebezibadaz.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/40877743374.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/numixaremapusejoz.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/nabikadeduvak.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/93475241061.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db780deb3b---fabibebejobukopamar.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/51013967583.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613166f727e9d---19079553851.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/71466881379.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/73351125260.pdfIn PDF document text
    • 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_off0000e77e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77E 18396 bytes
SHA-256: c49385652425f12bf23fc0cf71e85b18b8d60110cec8d273fae0f812dcb43171
font_01_sfnt_off000117b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B1 10148 bytes
SHA-256: 017b01d889d3e192097d2e5810150ba1335f8cebef69dcd04ba695d5a235e55f
font_02_sfnt_off00012e9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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