Malicious PDF — malware analysis report

Static analysis result for SHA-256 aee62e9d7c36cef4…

MALICIOUS

PDF

81.0 KB Created: 2021-09-15 16:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7fe54067c6081eceeb61358b07c450a7 SHA-1: 17873016dacf5ffdac635b1f866d7c0556b27f36 SHA-256: aee62e9d7c36cef41e466ed4414e291c42ecc34121223d363fc8b9d43af0669b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and compromised content management systems. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs suggests an attempt to lure users to external malicious sites, aligning with spearphishing tactics.

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://chcial.ru/uplcv?utm_term=let%27s+explore+diabetes+with+owls+pdf PDF link annotation
    • http://flairpens.ru/uploads/file/95416665985.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/wujodebutonazagumuxifa.pdfIn PDF document text
    • https://zemtechnika.lt/public/site/0files/64095082034.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/bitofapixaroxu.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/f8cee571a9ab6db0d4cc36d8c82c0f82/9483279565.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/wijevabatisojaxurefik.pdfIn PDF document text
    • http://mawratanews.com/armedia/uploads/files/20653098309.pdfIn PDF document text
    • https://vnmmalta.com/userfiles/file/gukikuzatowukatuwaravo.pdfIn PDF document text
    • http://king-tableware.com/uploads/files/202109011722519285.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131afb3afab2---42981102617.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/81991435109.pdfIn PDF document text
    • https://wanfutemple.urwaydesign.com/data/file/userfiles/files/lufosepi.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/48882816639.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/nedegexajat.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/famewapatewevewonutuxas.pdfIn PDF document text
    • https://wittnebel.dk/file/jevinusoxigufu.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/dilujatavolepo.pdfIn PDF document text
    • http://ipublicity.cz/data/file/36928208488.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/finufuz.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lobipufedajefidodes.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/dobujomexabifimob.pdfIn PDF document text
    • http://shahgrp.com/uploads/44123251668.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/hldal7fp1dvsu56muqlu6pl4r5/liluxokosiwises.pdfIn PDF document text
    • http://qkmedica.com/uploads/userfiles/file/jobasedenivezapo.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_off0000da3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3A 16488 bytes
SHA-256: 9e2edb3f2a21408c4b6f31d204d916e6a2d69cc00f68ec1875b2947405710cea
font_01_sfnt_off000104db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF2 10808 bytes
SHA-256: b321803c91abfc367700a22ef07e5bc17479fa8849bd83ce6bb0ac86f194d274

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