Malicious PDF — malware analysis report

Static analysis result for SHA-256 a062d9629ba26825…

MALICIOUS

PDF

89.2 KB Created: 2021-06-27 00:19:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bcaa655e30a38e8ea4c7a4290ff5cd91 SHA-1: c02e58ee53d44f3b36174e317d172875ad73fe84 SHA-256: a062d9629ba268253a504ffb93059fe12dcf55f10111237df14440ef45e886f8
196 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document likely prompts the user to install a fake browser update or extension. The embedded URLs point to compromised WordPress sites, suggesting a link farm used to distribute malicious content. No scripts were extracted, but the overall pattern suggests a social engineering lure to compromise the user's system.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/cpblf0reogm19lpq1jqaftfhbe/xikosenidotudilajeb.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/c93f2879940a4f0f119f70d5429d07d3/lazas.pdf
    • http://gasthaus-steinkirchen.de/img/editor/file/lokiziloseditakunu.pdf
    • http://titadoorbinhduong.com/upload/files/2999348088.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/b10000a1d7cc7e058a7befe88533e401/jorovuku.pdf
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/nt0vi6arsljdikacuvmssmudc1/96568474142.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/58e924c410ed96dab105559811f7a9bd/figuj.pdf
    • http://adamlegal.com/userfiles/file/52147891220.pdf
    • http://elitaliaweb.it/upload/file/87326076464.pdf
    • http://kme-kme.cz/files/file/95607656628.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4c557412e---92127648459.pdf
    • https://krono-original.vn/Images_upload/files/92026401584.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606c68dfb7b1f---46385306249.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/52qngkvepak8o5esiq3nr9i90f/mofoxe.pdf
    • http://pobierzplik.pl/uploads/files/mejetilemuv.pdf
    • https://readandenjoy.ae/userfiles/files/13402354910.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec6419b824---famuwumuxijajeluzetuwi.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/dj753oipbpfj61g14o7q9j2or4/muperinopaku.pdf
    • http://vodnik48.ru/content/file/9293052054.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16098bdab363e9---90708698048.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4c680a86d---medafivapanukugezozu.pdf
    • http://kppzp.pl/userfiles/file/larebidemig.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/4454248e047f41c07b050548f73cd44f/18242088137.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=chrome+update+apk+free+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb25.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB25 16792 bytes
font_01_sfnt_off00011337.bin
cfe1c85278da6f4e29c944ffbede74f03d5e24429e0b0934e15a56172befde6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11337 16688 bytes
font_02_sfnt_off00013e81.bin
296b2715e00df611d5a39a743e0a275c423fe12a15d914984ed29a7d2ecab395		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13E81 10812 bytes

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