Malicious PDF — malware analysis report

Static analysis result for SHA-256 da6e14b84fee03be…

MALICIOUS

PDF

80.8 KB Created: 2021-09-12 03:44:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 325462b281d36086f3b9bbbaf92321ce SHA-1: f3ff773eda9341e3ad8b63716247e906561c45c0 SHA-256: da6e14b84fee03be16205f444f16473cc1d542f6a56acbe5cd6f4424aa6fbda1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple PDF link farm heuristics reinforces this assessment.

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 http://zonwering-nederland.eu/ckfinder/userfiles/files/70683769956.pdf In PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319c6831564---93306375447.pdfIn PDF document text
    • https://emprenderem.cl/files/xasawevunep.pdfIn PDF document text
    • http://ktcz.eu/files/files/22524702216.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/bedig.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/sinowomojekexatozirotaxeb.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/wimimemarotekizuti.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/giduna.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/xeravagupuzepopewoxuxodob.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133d3f5c3f6e---16305434844.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/vufulivosopivijinufivewu.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/nimetixuperizez.pdfIn PDF document text
    • https://citronel.com/userfiles/files/23497005826.pdfIn PDF document text
    • http://mijn-nederland.nl/userfiles/file/vutabopogevitosikikojagar.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/xufutiv.pdfIn PDF document text
    • https://niagarablock.com/application/webroot/userfiles/file/madudaluritol.pdfIn PDF document text
    • http://fractinvest.com/uploads/file/23246725826.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132279570435---97599794152.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d382b09f9d---fifegak.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/somufug.pdfIn PDF document text
    • http://bassonconsulting.mc/userfiles/file/xodinawewuk.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/sq8kpme8hr773afvpt6altbial/66989843473.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=stylish+text+fonts+keyboard+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://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_off0000d5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DA 17512 bytes
SHA-256: ecd2453ecb043e3796d0b7ff79792e6ead2bf721a9c56d8c53f5d08d27b5fca7
font_01_sfnt_off00010382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10382 11120 bytes
SHA-256: 9def71f556f91eba832bfafc83d08e9c11e20d5b85ddbdeb200598895efeb4a7
font_02_sfnt_off00011d34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1