Malicious PDF — malware analysis report

Static analysis result for SHA-256 5642a009b83f370c…

MALICIOUS

PDF

83.7 KB Created: 2021-09-13 08:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8dd974cf037ebcb692c27e648a57c775 SHA-1: b298dc2fc2d63ad09f9e1e8bd9e50b5485dace01 SHA-256: 5642a009b83f370cf6fa991f1caaae5c5b190841d9f6f84a251a0f5bf884a5da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to direct users to external, potentially malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://garglob.ru/uplcv?utm_term=monster+hunter+game+ios
    • http://headrepublic.pl/images/files/7657208803.pdf
    • http://www.offshoreyachts.net/web_upload/editor/files/jiwazaluwubuzume.pdf
    • http://golfvillageonline.com/userfiles/file/mewirugozurilixowakaz.pdf
    • http://veterina-hrib.cz/user-uploads/files/rowafanijefox.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e673216780---sijinamaro.pdf
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/senafuluzotegubadopasajo.pdf
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/89734057573.pdf
    • https://mintowncoffee.net/uploads/images/files/megoputabinefewiw.pdf
    • http://hightopeducation.com/cms_uploaded/file/57325133375.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161394b9cc9764---gaduzoven.pdf
    • https://jagamimpi.org/contents/files/wenigo.pdf
    • http://mercuresamuichaweng.com/admin/file/vosomolozalurosibatil.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338c397cbfd---napoxefuwitaxiropu.pdf
    • http://hacsbathtarntaran.org/~/userfiles/file/zokifudozefo.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/goiortul9cc01ir75kfns4ljk7/pefaronipumotukizudawar.pdf
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/19272316581.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/e03dda28ab8efd4e1d563b7e11bf2a93/63592592208.pdf
    • https://sadex.pl/fck/file/96303716301.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613741351ed73---30364520521.pdf
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/zikalijudun.pdf
    • http://files.ibiza-ferien.de/file/kefegitaduxezusijeke.pdf
    • http://elezioni2014.gds.it/userfiles/file/gegonuxibo.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_off0000e087.bin
26749cb1c617eeff1730c3ac28c114b64e147645a7ecdf7075dc543149e3d4a5
pdf-font-stream PDF embedded font (sfnt) at offset 0xE087 18660 bytes
font_01_sfnt_off000110e8.bin
1911bbed9cb48d1f8959215c29c2a66e099a8ad922cd2c4401535a84db036f51
pdf-font-stream PDF embedded font (sfnt) at offset 0x110E8 10600 bytes
font_02_sfnt_off000128f9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x128F9 16792 bytes