Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfc93ce4225f246f…

MALICIOUS

PDF

72.2 KB Created: 2021-09-01 12:03:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c361e9867e8c981c7e125d596eb25b50 SHA-1: 9f7a34f50c3d27916ffe26a5774ee64d84646742 SHA-256: cfc93ce4225f246f3ce4fab96d897c96330a00d5cc3b8236043f877b665646f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The file's structure and numerous external links align with techniques used to obscure the true destination and evade initial detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=humma+song+mp3+free+download+bombay PDF link annotation
    • https://penal-garazh.ru/files/56267240896.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/71124811629.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/51c5ca15d4be0078ea8443e2c399b190/2637801180.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/so86orck3n55nstsrfoa54ukd8/pimebivolidetevokofopisaj.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/20520608826.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/78522966620.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b61c3c9d9---fasemezupazajajirewig.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/vagiranobibi.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/miradepazonituke.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d752749093e---42668536723.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4b595814be---94796544984.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/bowefajasivigazar.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/lomojefotuvam.pdfIn PDF document text
    • http://sjanzee.nl/file/viladuzusosogitejo.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/58410104408.pdfIn PDF document text
    • http://randalljroutson.com/clients/44711/File/jememule.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/musalilop.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/diwobugalivareg.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/87322362057.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718a6487906---xilodamavudeguxaduzonesiz.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/jabefumafobinaf.pdfIn PDF document text
    • http://chinazzjx.com/d/files/fopiragalajarawoweti.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/tobaveres.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/2463190047.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_off0000b8a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B6 15696 bytes
SHA-256: 2edd034bcbf724c1bb4dd3efb83e1be5062182d79604260e53e3aaa73f770125
font_02_sfnt_off0000f8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F0 11256 bytes
SHA-256: 45020ddec94da69956e3bc808fefef14e6d888111c1c7cd52d590f3868930dac

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