Malicious PDF — malware analysis report

Static analysis result for SHA-256 e610089fd945382e…

MALICIOUS

PDF

82.8 KB Created: 2021-09-11 04:52:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d1212a002d4b6711499e9ea9ecd26ab8 SHA-1: 5babfee5086efb81e2989525e0aabab3af3ccb25 SHA-256: e610089fd945382ed1857846c9a29843ef43538dcd57d12abed92b8bb37e5c88
196 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. The presence of a 'Fake CAPTCHA' heuristic indicates the document is designed to deceive the user into performing an action, likely to download or execute a secondary payload. Numerous URLs were extracted, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm used for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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 http://zeci.nl/im/image/70964231528.pdf In PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4e05a7355---kezuwajalizudoni.pdfIn PDF document text
    • https://oancora.com/ckfinder/files/dowosol.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/30876647474.pdfIn PDF document text
    • http://maydemtienvn.com/upload/files/19362933927.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/57505865561.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132af83f365c---wedibuline.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/munumesiweganitipojupu.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161332e0a1015f---mesuma.pdfIn PDF document text
    • http://rld-carbon.com/file/60826871900.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/40495316762.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/27543935017.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/revasarifemuximoli.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/68679814235.pdfIn PDF document text
    • http://888chji.com/userfiles/files/dejifeganovemawasoximezap.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/77853187057.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/49509895012.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/jazamaju.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/17695243074.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16132b54e3180a---87298570901.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/nupiwatuv.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/32985058603.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109052228183088.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613be48616440---50364176336.pdfIn PDF document text
    • https://svenjakretschmer.com/ckfinder/userfiles/files/dabobojawuveda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=hitman+apk+download+for+androidPDF link annotation
    • 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_off0000dcf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f50a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50A 18704 bytes
SHA-256: 1e1007e42098c044c960ba7f02c4d3330dc01c2d7bb0ecb59df5cd106c7d7285
font_02_sfnt_off000125cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125CB 10528 bytes
SHA-256: ec4ce291ee02332ad73fff35418d523649732e0802f25c4c84fed36ca75b46cc

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