Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e3c8d729d564e13…

MALICIOUS

PDF

73.0 KB Created: 2021-09-18 20:33:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3bd386f1c637cecc51686947537ddce7 SHA-1: 342ab853858b6fb75209e121e90caa85ca88d60b SHA-256: 7e3c8d729d564e13045c54d37ca5e3a0cf1a4f6b3cc9d5503928114564163ba8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a machine learning classifier and ClamAV detection. It contains a link farm pointing to disposable hosting, a common tactic to obscure malicious URLs. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a method used to evade gateway scanning. While no scripts were directly extracted, the PDF structure and link farm suggest it's designed to facilitate the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://forexinc.ca/upload/editor/file/tosok.pdf In PDF document text
    • http://bn-biz.com/userData/board/file/12894587449.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/4148567445.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/rogagopowajulemowavej.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/vativerejobokomefunob.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///39323604957.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/a65a10d2169231c0ef42df4181a7ceb5/wigolanurugire.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/vugisuveja.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/161329cf147b41---15250614657.pdfIn PDF document text
    • https://cdmsig2.com/ckfinder/userfiles/files/sojukubolojawiburele.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/0759fadf5ad8de0c12dab2e4fb89ce8b/59222245225.pdfIn PDF document text
    • https://marosme.ro/hirek/file/sabojejebasegega.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/83946387829.pdfIn PDF document text
    • https://panama4d.com/contents/files/66391729781.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/47613987673.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/67366002828.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2bd7f1f25---rejisudanabupokibe.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613216c3f0b5e---lolujetanasafubegodunubu.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/menukodeputuwopelalun.pdfIn PDF document text
    • http://jump360.co/upload/files/20210913202731.pdfIn PDF document text
    • http://elskenecologie.nl/files/77841746880.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/49287573462.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/1557008897.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+recover+my+phone+passwordPDF 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_off0000bcd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCD3 15864 bytes
SHA-256: cfeb94e16b696714c35adefc7e782f6811fc0b170d10efb98d787bab64f826b5
font_01_sfnt_off0000e53d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD54 10900 bytes
SHA-256: 4e0accb19be890b7da2dc914df191169acd75733b6feaa3b4352c74514b5880d

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