Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dd45a3f7c152fdf…

MALICIOUS

PDF

92.5 KB Created: 2021-06-28 00:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2ad61e545c61fba651dfd097eeddb850 SHA-1: b67b58d0d30d2468dd452ad26f297ec087296baa SHA-256: 9dd45a3f7c152fdfd8119a47630eed98955efdaa9a4e0d7be7ab6db812a2caed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing lure, potentially leading to further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://catamma.ru/uplcv?utm_term=what+is+the+bond+order+of+cn
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778cd76c3d6---87644415538.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84607ba826---rivoxezesuwolariku.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/2hb0ubcfa94rvh1llvrkav9i0e/wibabivafitugapavobufupig.pdf
    • http://mdsalon.ru/img/lib/file/41659121886.pdf
    • https://deltagroup.bg/uploads/file/43537043633.pdf
    • http://progfin.pl/userfiles/file/10369625962.pdf
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/hmr5h98sl0ftdpq9js0mt9s1j0/89234020710.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a3ff517c634---71792078288.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/f9sgcrhafcs7a4hq3l6ntv8n1l/daganokiwapawuberaz.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608b274e7be22---xomowezimivefipe.pdf
    • http://greenlivinggarden.com/htdocs/UserFiles/file/61145626650.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16082f1f84bac5---62605065849.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/670fhsst36uvsnkrrundi7hcm7/96391199319.pdf
    • http://duda-tech.pl/dudatech/upload/file/6062747700.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1609dcd7261597---37530574109.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/it5d39ncmmnroglq0v0g0nrgtn/fakojiguwurirumojudesefo.pdf
    • https://nbcmedia.vn/ckfinder/userfiles/files/relinekikazutopemekeken.pdf
    • http://ipmarketing.net/userfiles/file/96231313932.pdf
    • http://fontanarosaserigrafia.it/userfiles/file/19269443601.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/fd479cea1b39340c19123c842dbddbb5/nefudi.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609d24dca1c65---44765152177.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa1c0553aa---17299107570.pdf
    • http://matkinhantai.com/luutru/files/38258553937.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6e3d78b84---54190947585.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100f1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x100F1 16792 bytes
font_01_sfnt_off00011903.bin
72499a937de12d332fddc6959531adef621624b331b5890be551975e9478976d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11903 19288 bytes
font_02_sfnt_off00014c5b.bin
d677aad91dd755e2d68958ba58e22772d38ffcc8192bdf79d2298e4152ebc35d
pdf-font-stream PDF embedded font (sfnt) at offset 0x14C5B 10660 bytes