Malicious PDF — malware analysis report

Static analysis result for SHA-256 e777bbbcf70ffe4b…

MALICIOUS

PDF

83.1 KB Created: 2021-09-27 17:44:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a187e26f34ee61a3108c7e8f3a9c6eac SHA-1: c9dfcba48109cb3f33324dd8464082ee4aa9b7d3 SHA-256: e777bbbcf70ffe4b09884e6612701e878ef7745b16335f9b046efd54003560ed
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=surya+namaskar+mantra+in+telugu+pdf PDF link annotation
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dujipunaranuv.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/tuvamurudimebuvapefesux.pdfIn PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/bosunapafepetubax.pdfIn PDF document text
    • https://hankilfood.com/userfiles/file/20210924111436.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/rumoxojawuxiwazu.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/23084037837.pdfIn PDF document text
    • http://bjjiffy.com/upload/majisagerabi.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///17539118026.pdfIn PDF document text
    • https://shreegroupco.com/userfiles/file/dobem.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/da6bc8fbfacceb7c9be89b8568bb9ed8/62678161989.pdfIn PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/94171007496.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090515252052.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/tigiteforov.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/75684773734.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16145aaccb2e8a---98321530904.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/kizaruz.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/ginitonisanokapigud.pdfIn PDF document text
    • http://kamakuralosgatos.com/uploads/files/78634322394.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/gupuborukexijufufiruwa.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/5678272149.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/leregaliwirefikumebuwino.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408f374af1e---kilegunoruji.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/kowupiro.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/38294289960.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1613251aa6c880---mewupulen.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/80356865661.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF84 21244 bytes
SHA-256: 41680fb929f4b25974ad6ccfa654a758417d57ae6b16ae35fdd30fbd4299a644
font_01_sfnt_off0000f63b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63B 16164 bytes
SHA-256: a0f26d9ec2bc0bbc84dfb8c1a224a49f7f70479ac92e21d726acd811d43f3bd1
font_02_sfnt_off00010be1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE1 11100 bytes
SHA-256: ac12e916ca6f11a8ea6b92c04d26af8aa9b05735d0aa5e3fea926f54c57e5a28
font_03_sfnt_off00012595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12595 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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