Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f465de7c4e36196…

MALICIOUS

PDF

92.3 KB Created: 2021-09-06 21:27:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e6491fb81436eda77d40e27e5cffecfb SHA-1: 7d9b3ac7e13da76253df10f08a2720d960bbdd3c SHA-256: 8f465de7c4e361961668da53e26d6ab1b282cbe2074fdabb9c368b66e5be435e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content likely prompts the user to install a fake browser extension or update. This, combined with the ML classifier and ClamAV detection, strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://cructi.ru/uplcv?utm_term=xendesktop+feature+matrix+pdf PDF link annotation
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/57942259181.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0e227e12f---14387014654.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/makekujiwevux.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/o0s5n5829fmst2jmbdckpk24p6/10917434124.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/e9384b2430d7def5ec0ec744742c5011/gazugoxesibapavejof.pdfIn PDF document text
    • https://www.utn.ac.cr//sites/default/files/files/rabumel.pdfIn PDF document text
    • http://dejede.com/userfiles/file/xiborifovukedofiw.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/208d3dd13cfafc16698d27d698445b3d/35757674276.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd9479fd35---13099965331.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/nebekelorije.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/rofexawozesemanasisaxo.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884e98d6490---34851690528.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/jalumawufisozida.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/199a2e0951134c2beb9b527f4e7cb546/mugubazivitalejirevaxe.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/93654004545.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210625200229.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/83004231051.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ec67a40d2---mebikapixexegorusi.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/64056817771.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/nuwixegokufikozusanewuni.pdfIn PDF document text
    • http://hevolta.com/upload/file/jijabegemomepeno.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/37447443751.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082851dc1042---likebiluxunubenunarave.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_off0000fb89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB89 20704 bytes
SHA-256: 46b4bd45c930ce01874ffe20b820938a9d31ebaa7f1210c208ce249f7e140291
font_01_sfnt_off0001321b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1321B 10916 bytes
SHA-256: 46a7102260bc182d3f59b85d4d15caba9259d5192659ea571a0ab6ab32fa3504
font_02_sfnt_off00014b67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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