Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd215958609f7005…

MALICIOUS

PDF

73.2 KB Created: 2021-09-12 11:28:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fbd6d0887d5b7d089533079531599ab2 SHA-1: 77aee82dc68b1b0ed7901bffb5458a8ef2a3a588 SHA-256: bd215958609f7005beb66c87597410b99b2d88152c45932818f21f715f45007c
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised WordPress uploads and other disposable hosting, suggesting it's designed to lead users to malicious sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure indicates a link farm intended for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://laborke.ru/uplcv?utm_term=d%26d+familiar+character+sheet PDF link annotation
    • https://kiaavcilar.com/upload/ckfinder/files/68528350530.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/bepixajeke.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/85479382144.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/bozenobolasizido.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326a7c28da3---48652512271.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16139414beb6ce---69247321677.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/luguguwademupupi.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/xajovivosugiwunim.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/565b9031c78bf9ddabab0fabed6872dd/86665328049.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/pudutix.pdfIn PDF document text
    • https://binhvi.com/upload/files/moruberedo.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/c648cc2d0b6d9b82869220887d84fda7/3170212379.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-9/20210909191835777364.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/17843682504.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/46975913873.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/pijufore.pdfIn PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/bozavidapopisosis.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ced80ceb97---rexezumifafipukevijafus.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/20104303943.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/tediromadutinowifu.pdfIn PDF document text
    • http://nemochem.cn/upload/files/farubi.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/43929924249.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_off0000bb84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB84 9076 bytes
SHA-256: f695977626623e59fedb2fbedebd468d0acf89ff6f6ceafeb3cee4351ddee6c8
font_01_sfnt_off0000ce25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE25 19176 bytes
SHA-256: 88f72b188b13a21282f50f2ec93ca7cb07e42647d0e89cc1e3861e0ab6078efe
font_02_sfnt_off0000ffcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1