Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b92551eb3f9c5ee…

MALICIOUS

PDF

80.0 KB Created: 2021-09-06 09:17:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 867371f934375dad7da028cbf2ea52ca SHA-1: dad969611081b36d82dc2c26ee3d06f2c7651256 SHA-256: 5b92551eb3f9c5ee25cb1a813314c5807a5e82615fc71ce0d4df0480ade4c11b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://inwebjor.ru/uplcv?utm_term=hutton+v+warren+pdf PDF link annotation
    • http://tomgiongvip.com/uploads/files/file/kerisozinufiwideja.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160e30c8fc7bf5---xiwizo.pdfIn PDF document text
    • http://sclifeguards.com/clients/16854/File/68915471653.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/sabagi.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612510c9aa9c9---losakubonubejafaluj.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4cf082a35a---10392627064.pdfIn PDF document text
    • http://dinobajka.pl/Upload/file/livupagi.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/d725b96da6589dfc1ad1aab167b633af/80618684977.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b42b8e56f34---dadorodomawajilu.pdfIn PDF document text
    • https://facade-metal.ch/ckfinder/userfiles/files/kupegitobelelabiwebupawo.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/161193d3d30d35---gusekisumufuzepir.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/81723558386.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/o0hnmr68712n430cij4gsifn20/47602726954.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/4vk9ed9m5a0te7hq4geq27tnk5/50934341990.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/40591539627.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/162663966219.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/37995945620.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/77769882362.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/d02703ecbc14bf8b650ca5a656d9c653/lurasisokolibanodiwexuxu.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/xeregivutafirureb.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/70079592861.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091926102635---relak.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/nelexefawed.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607313c4a25ab---32038824566.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/11258512219.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_off0000c8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F3 21916 bytes
SHA-256: 99f5314d9f43bd4f501a9044b13ac51f2382c83147d7676f558fbde563f218c8
font_01_sfnt_off0001024c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024C 10428 bytes
SHA-256: 20a5894fe47c39bc3554015eb914b24584ca81a61be8cc467bc905c8aa05ee42
font_02_sfnt_off00011a0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1