Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cefa6e73e3293ad…

MALICIOUS

PDF

87.1 KB Created: 2021-08-03 04:49:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f5185694ed0ebc36a9c9868a61bb9b3e SHA-1: 6493582370065e741f0f03c0d42a95c38274329e SHA-256: 4cefa6e73e3293aded11f3598f5206b5159fc0a6804b886ca269e87a3a8ad727
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to potentially malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://chcial.ru/uplcv?utm_term=is+mod+cauliflower+crust+keto+friendly PDF link annotation
    • http://meadclassof1991.com/clients/c/cc/cc689d7a74a098ef67b43942063c7ff9/File/21595931153.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/nemufipelewopigujin.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/60382418298.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/0mta8cbt0lejr71dqp5uds6bl6/lomoxogi.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021072407535088.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a598c083d---5424210818.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfddb9be26---wokosorudibofadivusitat.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d99fbd29230---zezajubemisomusajutonej.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/35b4346e7b0e4ebff5f267a38b75f926/lewipajogikojijopavafo.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/86318363399.pdfIn PDF document text
    • http://cuacuondaiphuc.com/upload/files/sutabiraximidopodixabil.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/padivuso.pdfIn PDF document text
    • http://aweibel.com/Photo/file/wedumifupitobiwibebilogoj.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/slrko5i7o8luie984t2cardsko/1762490083.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/tiguwobodenufitofu.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/1bibai80v7bb2g4g77148sao86/4866634482.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/zarobemeluzoduda.pdfIn PDF document text
    • http://whsclass1968.com/clients/f/f8/f849445bb2fb8f42e7c863050dc1ba38/File/49538140139.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/6f5750b6b7faea6e2bebd04519c13fd7/91389727919.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/boginibujinekanelafaxu.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0b9e8579f---bokaranuduwedokemogapekex.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_off0000f0e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F6 17108 bytes
SHA-256: ed9a25affab7ffb0b3a7f0771c28bfa28c57787577e4247f761f519c0ca4b4fc
font_02_sfnt_off00013570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13570 10980 bytes
SHA-256: 1c65f55286fa5e5545cd92e55a1cd5f1cd5638b1330370d419100361c01e51b8