Malicious PDF — malware analysis report

Static analysis result for SHA-256 8218ea9e3efee4c3…

MALICIOUS

PDF

78.9 KB Created: 2021-09-05 05:51:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 6ff4b936de001fed6e2e0704b64b716b SHA-1: cacf82a15bd9be49a702ab7b225f12977a16931b SHA-256: 8218ea9e3efee4c374ff18ff39f4c75ff3f4bca4651916d70370f10f64902be0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://huntic.ru/uplcv?utm_term=pre+commissioning+activities+process+plant+pdf PDF link annotation
    • http://georgewongdesign.com/gwd/upload/files/87279092047.pdfIn PDF document text
    • http://asahiru-ban.com/files/files/15529466932.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/24417402220.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/dowosan.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/pokimalusu.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/motulasufivesavipep.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/8b4bfde0375a0b7f3af9d7f770c30e94/11819433867.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/milubasodotetepa.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118d990cab40---suxegaralofeb.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/161046bd9403b7---kedisojegikamovojaza.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/xopeg.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/0c663074d10c8aed5f4f62eb00491df7/tejavisibowujibebewop.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/aa56152be9a5d954d900fcbcd5cfac43/nuwuna.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160714b60f27bc---80856440273.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2b0980370b---85346808556.pdfIn PDF document text
    • http://ondamarinarest.com/upload/files/fewivinole.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c30b80076---50039657594.pdfIn PDF document text
    • http://controlsystemco.com/cache/fck_files/file/84757809663.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/9h84irpqf5eik9871gpc0jkgr2/defujanozadote.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/47930376594.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096ca0b7e099---54269967416.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/76193783925.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125b3d76b4ec---waremagudunu.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/9b1ec0ff661a414062bd363bafbff618/6976928723.pdfIn PDF document text
    • http://stasta.com/userfiles/file/xiwamibolupasoraxu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF60 17288 bytes
SHA-256: d9b024ea1b4feb2e323ba2d13b75311ce3d25ca5b3808e1cd08b915881c665e4
font_01_sfnt_off0000fc2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2B 11028 bytes
SHA-256: a39e0199cd79ec44b9896a04ceb66e2670fdc63670c41588b7a5df457cde96d3
font_02_sfnt_off000115a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1