Malicious PDF — malware analysis report

Static analysis result for SHA-256 8666c3dc5f8743eb…

MALICIOUS

PDF

85.2 KB Created: 2021-09-22 09:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7b93aa5d765100e0f1156383ea5aad81 SHA-1: bf92a9481e6317de313573bda0f638fc7c5ff11e SHA-256: 8666c3dc5f8743eb5957687e8cd13719368124ee3843cea80d944f5ac464d6c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains numerous embedded URLs that form a link farm, many pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates this pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://catamma.ru/uplcv?utm_term=android+system+recovery+3e+reboot+system+now PDF link annotation
    • http://sloplast.com/userfiles/files/91990952063.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/78759024261.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/49020006335.pdfIn PDF document text
    • http://innotack.com/userfiles/file/gusokituwarowemusab.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16144154e3f3f6---32385146344.pdfIn PDF document text
    • http://avesta-hmora.boj.se/uploads/userfiles/files/wikuvoxetelawusapetun.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8b12a7299---jerodugeri.pdfIn PDF document text
    • http://police8coop.com/UserFiles/file/beselirabomusu.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613692230b24f---31403828146.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/pawirisul.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/c037dceba1cb71a65a8572ec938086b0/rakudegisodovovawefej.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/161333051860e9---wawetupuzefufaleke.pdfIn PDF document text
    • http://linza-market.ru/upload/files/41036405079.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/ratito.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/wepewesiderivirevis.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/1569159889.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130c0b53eb12---72704534667.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210918004656.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109160143182024.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/zumexafedovaridelifejofu.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/97193835738.pdfIn PDF document text
    • http://pk-rowery.pl/user_pict/file/825114137.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/wiwuwafomoku.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/32685098994.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/b4205a930662753c679f1590e1330960/38979116458.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_off0000e42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42D 10884 bytes
SHA-256: 745cc00c4e6c4fa73adcce4f9855e21821b8dbf83e769f9b9a54f8c7dc03fca7
font_01_sfnt_off0000fd80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD80 18868 bytes
SHA-256: b57af43ff7d9050c5bbe5ffd4d9cb9f0e0f22a5b7e7cafd95f95743fc364a217
font_02_sfnt_off00012eab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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