Malicious PDF — malware analysis report

Static analysis result for SHA-256 230e76d446e6d9cf…

MALICIOUS

PDF

70.7 KB Created: 2021-10-01 08:11:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 77a724d13ba998ffa0fa18281acea50a SHA-1: ec967ef286e06699ad1b7bacca65f7cdf8617531 SHA-256: 230e76d446e6d9cfaa5182230aa657c38f22406d0153084df2760a6f6d5d829c
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 delivery. The presence of embedded JavaScript (T1059.007) suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://kancelaria-perfect.pl/app/webroot/media/files/joxemosufalefa.pdf In PDF document text
    • https://medtek.vn/storage/file/20004608588.pdfIn PDF document text
    • http://sswjeans.com/files/nobekawojodomerojotoru.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413dfbdd1f4---wajur.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/waxemirulabeloxeputafaf.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/gebukejepixawezudir.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/32249991082.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/navikid.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613db26a0b569---woxiziwut.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/53314263155.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/74786317364.pdfIn PDF document text
    • https://kimcert.com/E/file/13323941694.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/wuwuvanuzekufogitunu.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/xonepikalomut.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/e0373a4a798537a8369b57b1c3d30f86/goxikububuvoxege.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/zipavekorok.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/57577244345.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/55493445138.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/futajupuzanupupapijepilet.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/petorenokikevaga.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/30176948125.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/buwukileretetosebaki.pdfIn PDF document text
    • http://www.sainteuphrasia.com/www/js/ckfinder/userfiles/files/23833001549.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=archery+king+play+storePDF link annotation
    • 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_off0000b0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F6 16580 bytes
SHA-256: bad50b74bf22068d07608bfa45bf9a2786574e0a697c71e5d1c1cdc2bd9e391f
font_01_sfnt_off0000daa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA9 10840 bytes
SHA-256: 8c1640abbf3f5147ef13d7583509d4f36fedd41d1eda0160925fe0a74599621e
font_02_sfnt_off0000f3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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