Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d0186ff7a98b77e…

MALICIOUS

PDF

80.8 KB Created: 2021-09-04 10:04:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9a10159fa7939e78371f16843efccd85 SHA-1: 5f749843bcfbcf0cbc9fb91e3f631ff2271ff5a8 SHA-256: 4d0186ff7a98b77eeb9641fa97b28b058840f6955c458f2c667ee7275839638f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file is detected as malicious by ClamAV and exhibits characteristics of a phishing and malware distribution lure. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document likely prompts the user to install a fake browser extension or update. Numerous embedded URLs point to compromised websites and link farms, suggesting an attempt to redirect users to malicious sites for payload delivery. The ML classifier also strongly flags this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://chcial.ru/uplcv?utm_term=are+you+afraid+of+the+dark+book+pdf+download PDF link annotation
    • https://sahyadrisevasanstha.in/userfiles/file/4634807479.pdfIn PDF document text
    • http://meta-min.com/files/1431646737.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/zeponukidutujusefomitevup.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/56963890327.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca12868cfe---60914116392.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/9326989552.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/resulujagepubuv.pdfIn PDF document text
    • http://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/ccf62624662605d3de8e2f80fe2ef1b3/kinedimokutonazeburisu.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/98838994829.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/45219131710.pdfIn PDF document text
    • http://texmet.pl/userimages/file/60503411881.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16087145a8d30a---36664419262.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/92534662345.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/pexopajugusidamiparivubed.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/guviwaleduzo.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/rogud.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///sutojunutavazozokopopa.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/5771913970.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aea54b3c87d---kikufulipipapela.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1608333a28b155---83435985997.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611204ba6fa69---robiwudixezune.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c699b34633---mosurabali.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_off0000ce3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE3C 19968 bytes
SHA-256: f7f00b7f6a8122fb27cd51dd24e261b0367150916d46883414dad7c7b124ab43
font_01_sfnt_off0001024f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024F 10940 bytes
SHA-256: 0dea287565a0b98479125351a94f944273b3b9c6a2a26041541dc7fc2738fca7
font_02_sfnt_off00011b6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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