Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dab80da5ccdca56…

MALICIOUS

PDF

82.2 KB Created: 2021-09-13 17:07:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a7b6cf0a45c327b7dcc4553d106897c9 SHA-1: 196a9c56c144e4c6d2a21ccfde6b92e0702a633f SHA-256: 5dab80da5ccdca56ba022eda46331013d1b64f63f1d3e7f9a9e93e80bff4524d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or redirecting users. Several heuristics indicate the PDF acts as a link farm pointing to compromised WordPress sites, suggesting an attempt to host malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613deb7023720---36236292240.pdf In PDF document text
    • http://impex-italia.it/userfiles/files/66725867397.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/besepofosixabevifavemeju.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/91136881277.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/rogopikolakodabowonamo.pdfIn PDF document text
    • http://christopherdallo.com/file/kubamebameb.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/96922326516.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/82275896877.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/21016490088.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6263eefc5---80034395671.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/hjcqmv2kolqalig77v4lhb8ui6/jijavinenezeturabolon.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/34307005850.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/527204097.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/56127903570.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/80151045889.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613695fbba440---tefuxokakimajifesosi.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/7406682405.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/88984320335.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/zumino.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/94440759337.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/9640196074.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/51046060679.pdfIn PDF document text
    • http://romanasulcikova.cz/userfiles/11439795932.pdfIn PDF document text
    • https://maffart-guy.com/userfiles/file/49840664451.pdfIn PDF document text
    • https://pepsima.biz/files/file/vipojeroverozopujinapono.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+reset+a+phone+without+unlocking+itPDF link annotation
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/resara.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_off0000db9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B4 10920 bytes
SHA-256: a9d00f2c7da161c4867b18a428badf0d8e4f960dea4fdaa002de622edb1a9189
font_02_sfnt_off00010cff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFF 18088 bytes
SHA-256: 77cbf75103ae5de6ad7f9190eaa1f393989194a889aaaed1aee897bf5e981dc2

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