Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7ddc3c7a591bb29…

MALICIOUS

PDF

72.6 KB Created: 2021-09-19 02:23:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 43003e6a751de2907150b0f7b6ac9049 SHA-1: 524f0aa379cb6199c60bbfbd68ad8975db460275 SHA-256: e7ddc3c7a591bb299abea3da9ce121defc449bdf279d0871c54f612b2aca8d71
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs, many hosted on domains that appear to be disposable or compromised, suggesting a phishing or malware distribution attempt. The presence of a 'Download button' heuristic further supports this, indicating a lure for users to download a file. ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://martensmgt.com/business_school/uploads/file/61666463335.pdf In PDF document text
    • https://506hlapeta.com/files/file/21884807603.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138d576b24d8---vuravufevudulenoxowitasud.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/pisonu.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/62352995313.pdfIn PDF document text
    • http://agilesolutions.in/uploads/xebozumag.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/87822850715.pdfIn PDF document text
    • https://g-stampo.com/pics/pages/file/gimoxodofawisat.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/90864030381.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/votugedoledaxekoni.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/2jb33amogtrpo0sgsofbl9pvms/90296047247.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16138eb4570ed7---majema.pdfIn PDF document text
    • http://thueotodn.com/uploads/image/files/sibekesor.pdfIn PDF document text
    • http://lnv-cnc.com/userfiles/file/36891917684.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/65721715050.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/48469076438.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/3272ccf4efa1ece772c52e48e0dbbe38/7752563431.pdfIn PDF document text
    • http://rc-modeller.se/images/file///newubewaletasubupinovur.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/37225213917.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/94748535d286d4f20d0407982ba19e58/somuji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=remote+expert+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_off0000b88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB88E 17672 bytes
SHA-256: 348b136a478919d4930a968054f6c06bd85081b91df9ebea66354636fffaa9ec
font_01_sfnt_off0000e63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE53 10244 bytes
SHA-256: c39478339b9173df2237a5520080655ea7eaeff187c15a8104e6e22900356ac4

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