Malicious PDF — malware analysis report

Static analysis result for SHA-256 9db82095f1c2f16e…

MALICIOUS

PDF

77.3 KB Created: 2021-08-16 08:15:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0f91fa6bb1e1d6b68fdad809d7ff0928 SHA-1: 1c157910d2b7c7922a64335e766e862713ab613f SHA-256: 9db82095f1c2f16eb1095da88b1613b594b5abcf2c383705fad8df03129e14c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple distinct hosts, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b355d6f7d---tuwusoketuxuvuruxixomixa.pdf In PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/2paqrtu27mtslq0hlbm5t6cf73/tivaxolumewimujozuvudaruw.pdfIn PDF document text
    • http://krasneclanky.cz/uploads/24867925852.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/rokajetabapadoxanibawog.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/vofosevijusafa.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/n9jarvocqv244g5i9cqpelfh81/1031901536.pdfIn PDF document text
    • https://aspirans.com/files/file/73143963122.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/ropefofo.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/71609178712.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a179f3a214a---xidinidezom.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/v9056r7pc32jg490mnjjddchce/89570916490.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/xogijekanel.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767a4041e1f---44047951576.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/19548491852.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/136429308ff068a3d99cec3924dd6037/18741274534.pdfIn PDF document text
    • http://15thstpresbyterian.org/clients/d/d7/d7025cfb1d4df99eee5a588ecc3dd57f/File/64365707353.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e515aa46cc7---35174447023.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/89631386368.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/lebelazoweguwa.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/risebojexatotasa.pdfIn PDF document text
    • http://aromacosmetics.bg/assets/userfiles/file/94411516875.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160866db2223a1---98797477517.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=oxford+advanced+learner%27s+dictionary+book+depositoryPDF 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://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_off0000c4e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF3 18964 bytes
SHA-256: 2f1a5e7d32ab076b2b2bb212119b69a2c04f88b891ec92c38578618df1639179
font_02_sfnt_off00010c30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C30 11188 bytes
SHA-256: 7dbfb4ca46415e4a947e9082773e2f8201164e32225a33f4f9ffa47cc8ad0131

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