Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b416e4870d19dd9…

MALICIOUS

PDF

77.8 KB Created: 2021-09-01 01:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7b6f72c518caed2ba11d5ddbf46cf4d7 SHA-1: de5bc285fe1131b99ed7b37d77d008fcdc203da8 SHA-256: 7b416e4870d19dd979931aa44a6d1057d1cebfbb5e0b8b7fafd7e09849d031e3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. Heuristics indicate the PDF acts as a link farm, pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution attempt. ClamAV detection and ML classification strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://dnepropress.net/files/file/20726884719.pdf In PDF document text
    • http://consulcongress.it/uploads/assets/file/narijedijebixoxobasu.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/06sgsk21s3n98gnljueicnluf7/90804441799.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/maporoladodet.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/66954448566.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/besonulukasutumodafu.pdfIn PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/2323590401.pdfIn PDF document text
    • http://tochuchoinghi.org/files/35253488707.pdfIn PDF document text
    • http://baominhlabors.com/upload/files/wazibewugobilajosedifonab.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/c95fd40f1aedca4f59bd1d4336cd612a/xejusidaribodarilisa.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16076c76bb8917---difeka.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210901062119158.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/besugaxejenulej.pdfIn PDF document text
    • http://nessie-vinylcare.com/file/kameli.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/6887388031.pdfIn PDF document text
    • http://physiotherapy-warwickshire.com/user_file/file/wewex.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/07urmagqsk19r90jh1eai627sq/68557227651.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/ef08767a44593a2a29dd7cdb09115afb/konotasunuguzafofasub.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/fitelazejumelufowarepezi.pdfIn PDF document text
    • https://jurad.eu/files/file/83212705829.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd4aeb1e49---nenokotukew.pdfIn PDF document text
    • http://fpsh1980.com/clients/7/7d/7de5299bd6bdc19cdd6b275c058e9c4a/File/puzozemelomad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=rise+of+the+dragonsPDF 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_off0000cade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCADE 10632 bytes
SHA-256: 040f398e18dbf6ba39f57f2f91f364cb0c2a60cc60e12bc4f714c5e85f437aaa
font_01_sfnt_off0000e2ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB00 17924 bytes
SHA-256: 3e5a8783c72ca27e17460e748d7b4e2592986cc5576befb7d861cc0363455cb1

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