Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb12f3595462548e…

MALICIOUS

PDF

143.3 KB Created: 2021-06-18 04:52:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: cbdc193590acea78d30d5191fc0440ba SHA-1: 649ce14b8b93e228b22e194ca2dfac3516f293fa SHA-256: fb12f3595462548e51ef58dea88594c8c4b03e1e3afc0d4fc4fee19fc502aca7
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites, indicating an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL targets are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/3b396435ab60f6a4dc60cb6263ac74fb/58977817281.pdf In PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5182f1862---moloburazevotuna.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/8f658f9f687a511446f163fd757f8a85/voxujedudojatuvunilomoguz.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607c935e90245---21363908458.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/48143549950.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/609693edde2b4ffe61fb3332dc7ae220/31220855144.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/80136985279.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/5c59083055ef0bae31465659462fe91c/dajorawinozepomonur.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf590c30f7---wekedarozukuboraxaxogop.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/94156617701.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2dacb9544ede92917ef6d478351df59a/53333645220.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b0fc3d1ccc2---67520435120.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd73ad4705---lufalejosuwewol.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/da92c4a12d26d76a961aedbdd55980d6/pizinokafif.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607af627432a3---dosana.pdfIn PDF document text
    • https://khanikango.in/file/36980109117.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=yo+kai+watch+puni+puni+mod+apkPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00013f17.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13F17 59604 bytes
SHA-256: 128861df01938c7653cba0e653f782ce8b68f3f1046339588c03fbc7c4cebd4e
font_01_sfnt_off0001f42b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F42B 5124 bytes
SHA-256: cd44da8b2eac5db70168e6c69bc550bade20d45337daff5d263109892f71b73e
font_02_sfnt_off0002058f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2058F 11464 bytes
SHA-256: e7be379b37bda1c1ddc3540b6f9efad76131265c8bc9ffffea468a3786f5f9dd