Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee8a42f8689778aa…

MALICIOUS

PDF

82.1 KB Created: 2021-09-06 00:45:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dc367ffc12654e4fe3e55a065bae0940 SHA-1: 51705dbef10cd29359faaf7493a17dab51cbcfea SHA-256: ee8a42f8689778aad4c6b1c8f36d336dba212b8bb36f493e276a32054f201454
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely contains an exploit. The heuristics reveal it functions as a link farm, directing users to numerous URLs hosted on compromised CMS uploads and disposable domains. These links are likely intended to lead users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.urbanwaterways.info/files/mimexeguj.pdf In PDF document text
    • https://zlato-eu.cz/upload/files/48994825197.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/napefumejakege.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16099e4cb27cb8---wafipu.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d19a83d78f---kowitiwugiduluboz.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/2a1e90cc6bb555ec6d4ddb5166379946/9988110269.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/93950440442.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/83764043622.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/12508232065.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/30348668956.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1610ea57a7162e---nijorizuvozikale.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/71843864075.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/85341393746.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/wabetafilibegusemagepu.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/29351333511.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/jumijonup.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/tofoviti.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a9a8c3b58---8933399756.pdfIn PDF document text
    • http://parkergeneralcontractors.net/userfiles/file/92686965514.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/5cac2ece399854b91a30e55bbf05dd12/99874039190.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/78521342703.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/jiwunabolixuni.pdfIn PDF document text
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/07e9771beaf12ceef002d6784ba16159/17018142299.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/zeropinubopujajixukuwu.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109042346424823.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=relativistic+kinetic+energy+pdfPDF 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_off0000d9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF206 18020 bytes
SHA-256: 1276beb53b5888f248bad18b1cd993d78e4459fa4e667f9844d20a01799d4dbc
font_02_sfnt_off000120b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B3 10992 bytes
SHA-256: 9f392f3f5459b2fa20b3cb40ed0c3c070b9258d850df92084ac29d0916a60a63