Malicious PDF — malware analysis report

Static analysis result for SHA-256 926e565e52fccde8…

MALICIOUS

PDF

82.8 KB Created: 2021-09-12 16:58:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9a57f02ed1a4dec2e84ea6a09df59e79 SHA-1: 0dfa4365d6c3f9f71024b50f83731cb3a020a2e4 SHA-256: 926e565e52fccde8d4d60dc7578a99d12fe3a88a9636bc94ea780e443fa92afc
196 Risk Score

Malware Insights

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

This PDF document employs a social engineering lure to trick users into installing a browser extension or update, a common tactic for credential theft or malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs and link farm heuristics suggest the document is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://drafthe.ru/uplcv?utm_term=how+to+enter+code+from+iphone+to+android PDF link annotation
    • http://iphonedown.com/ckfinder/userfiles/files/pokut.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/16775170483.pdfIn PDF document text
    • https://hoavily.com/uploads/files/95981053056.pdfIn PDF document text
    • http://logicamail.it/draft/media/mufaganiwuraguxuvoro.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/pv3tgdu6tjp4gkbf3jl4643lp4/69206320411.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/93755a0d3b05243334b812bcde166327/vuvejazidevo.pdfIn PDF document text
    • http://twtqedu.com/userData/ebizro_board/file/4100602126.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/gapilazawowum.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/c68873e777b470c5c97b9acc9dd7e4cb/28294885771.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/putemisolaxeliwigoxo.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/samavakokikurumetitemogi.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd7b5c3712---sapilunibazuwidagakol.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612eae27184c7---xatonimavegepobebilike.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdfb8acb84---gomeg.pdfIn PDF document text
    • https://stopserv.ru/files/file/61858950552.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/03ad8d572f7db1905785596f4b9610ed/mawosobimo.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/38122604776.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/53293762736.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/36148320542.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16139f832bc9f9---zezaxivetomatizafifatoj.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/jejuvepirabodewimofizemid.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e898550a2---23217128633.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/powud.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_off0000e10d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10D 10748 bytes
SHA-256: bdbabbdadb05303237d62cc75e5ee72509da86d7d293aac8e5c0c52185359c66
font_01_sfnt_off0000f991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF991 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A3 16872 bytes
SHA-256: ad2a0f5e4eb55d901fab3f420581d9b14100a82181dd04b845961f2cc90148e9

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