Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd0ae59e4a14afcc…

MALICIOUS

PDF

90.9 KB Created: 2021-07-03 05:44:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c9079faf371f54bf04f02c8f9f8c162f SHA-1: c802ab6dcd00a6e18ca88a95491265de14369200 SHA-256: bd0ae59e4a14afccd504d2697b5df81ee42c4755fd7bb6abd16fe864a536b801
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of numerous URLs points to a redirection-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=montgomery+design+and+analysis+of+experiments+pdf
    • http://vetranhtuong.info/luutru/files/46597024282.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160def98547e8c---zuwuvetade.pdf
    • http://mlight.cz/archiv/file/ranugobinobadebaxavap.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608123c1ba92e---16719544095.pdf
    • http://akwarella.pl/user_uploads/file/33752524830.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160d2c4593acdb---memekemosoju.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/4b537c8c505c28181ddb9ff81671c59e/86062355961.pdf
    • http://macap.nl/app/webroot/files/userfiles/files/porirevaxiwa.pdf
    • http://imi.vc/upload/files/gonivazobaxuvov.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b7cd33c51---nivutav.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ea122a802---risamerivamumututinidofom.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a55a0bf0e---lemilimodimawapibe.pdf
    • http://aps-mes.com/files/file/6039359141.pdf
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/23fd6debe6a7aedc73fc0668120001bb/79418423167.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/43837518576.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078ec935840b---29799294144.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/4065667925eb2dc330abdc053564333a/47169038083.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe724cc6c2---84671167692.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bace63a4f---81582386000.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/3992ee7f3168c52914bcf9f8bbd9af98/39448229744.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abfc001984f---39856562818.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/0636d0998504507b3c63249bc8956995/baxorofimeloti.pdf
    • http://muzeumostrowiec.pl/obrazy/file/bupelujaredigiwogeb.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16078237643667---doxapakatuwi.pdf
    • 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_off0000f6da.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DA 16792 bytes
font_01_sfnt_off00010ef1.bin
8d04b322190b200eb39a0738da3b2044c81e857c60ee4a7032fc296d433a6b29
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF1 11048 bytes
font_02_sfnt_off0001287b.bin
970d22c3c05db4f6566d5942b0cf2ff88f41bb572dbda4c2800f02357e7b28a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1287B 20528 bytes