Malicious PDF — malware analysis report

Static analysis result for SHA-256 96d51d4689532b45…

MALICIOUS

PDF

88.6 KB Created: 2021-08-29 14:03:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 60656a3a0abff90da4f14708ccce56ed SHA-1: 22b7253ea48fef3fc5ae9531750b0771823a9b55 SHA-256: 96d51d4689532b4580872b1f510e7aa94cbe6edd4c59481a4ce95c1048fa1508
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. The file contains an embedded JavaScript stream and numerous external URIs pointing to compromised WordPress upload directories, forming a link farm. These links likely serve as redirects to malicious sites, consistent with phishing or malware delivery tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://camile.vn/wp-content/plugins/super-forms/uploads/php/files/hrt3nkmcdtsr1tlprf6ukro44l/64734170793.pdf In PDF document text
    • http://files.ibiza-ferien.de/file/60732782374.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607a89e41bad3---76405908943.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/47166e3240e08fffd0318491d20faaee/89621901170.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c90f76a19---36153414865.pdfIn PDF document text
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/tabusolinimifibolig.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/4238162489.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/c0d2d614687857e7e06ff871e1d1f182/rexexosifegoxulawi.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/perenemudumesilon.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2bc6cc01c3b071426b3971681d0991ac/4366616396.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/ea5a782e51ce79246b307a29e9cf4a1e/65007626919.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c6df5591650---46327795768.pdfIn PDF document text
    • https://zhansq.cn/upload/file/81322063901.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202107/file/62591823203.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59694353208.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c20897e79f---nijofopepevo.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/rogarabirudexi.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/frrj3k81ffc1b1ri96v2dk1vkt/60713045832.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/lepovanagupavabavewerofo.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608020150d70a---43018494502.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbb825b664---76208091393.pdfIn PDF document text
    • https://xn--arbeitskndigungsrecht-best-5zc.de/userfiles/file/55757205286.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160724f78ebffd---rukoroxogofulezopojapor.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/48343153288.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=the+virginian+the+crooked+pathPDF 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_off0000f31f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31F 18700 bytes
SHA-256: d472f2b3e97c295d006a4e7be33621369042fe8d90bf191f5a33e5425100505f
font_01_sfnt_off000123bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123BB 10700 bytes
SHA-256: 0154fde363b4286b6012f2bf2d4693f3129fb85a6fde2f96a84959bdc82c7ac7
font_02_sfnt_off00013c17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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