Malicious PDF — malware analysis report

Static analysis result for SHA-256 05a3b7dd5059e17f…

MALICIOUS

PDF

83.4 KB Created: 2021-06-27 10:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 11ad800e0420577db086ad0755709ad4 SHA-1: 9f6825405b2b73021aff3a620b2949461f41bfcb SHA-256: 05a3b7dd5059e17f4a311b110db8c678e0cb814c6f6dac4016f8e9d569f6549e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites and other domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://coretry.ru/uplcv?utm_term=chairperson+duties+and+responsibilities
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef69b5fb3e---64351005506.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ac3fe5c85---43605798658.pdf
    • http://cuacuondaiphuc.vn/upload/files/67378794634.pdf
    • https://pet-fashion.ro/mm/file/24741903749.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c38e5e419b---fujuwosomelebogefemub.pdf
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/e745d98af961f6e49212111e596e6b68/guvabenisanototegipafogo.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/113a2352b09f997c7e6cd43bf2a07431/nofixesatudedifosoxido.pdf
    • http://xpressup.com/userfiles/file/58845930904.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/8b444954eb20cb5726742c01af776fde/dezinuzewiriviwijebedu.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5dce9764e8---25905552556.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844d25f2e08---zofojaji.pdf
    • http://jmdfhjl.com/fckeditor/userimages/file/79816448479.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/3d55685158234347f4e6c788029ea4e5/76614996048.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e24fa7d8b---taxivibijimovabopibil.pdf
    • http://hilltop1976.com/clients/24685/File/gezubebuvuji.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d2f185bd1---14446588850.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986b73c1b28---gowovewemirijefoxu.pdf
    • http://tensoinox.com/userfiles/files/77920408159.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a4340c786c3a132a717ca8894efc16f8/85667885976.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc20d9d26c---ranigononofe.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/4ef391d3658276b1324999aeff942b84/693125218.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_off0000e4af.bin
c32cd7c130edd3e395891a9fad6c977f40f8e1cc784c113f5c8d7274eb53f09e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AF 16860 bytes
font_01_sfnt_off00011010.bin
117af6eb9a2fcdc08fcb16ee9184219f22f8a7d2f71da913218bde1945a1bec2
pdf-font-stream PDF embedded font (sfnt) at offset 0x11010 10760 bytes
font_02_sfnt_off00012882.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12882 16792 bytes