Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dc01dbfa3d77bb3…

MALICIOUS

PDF

70.6 KB Created: 2021-09-28 19:55:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 8f334336e84106e2b6728255a610435f SHA-1: 9b212107087e9a9d55677f5f6788e2846ef7481f SHA-256: 4dc01dbfa3d77bb39ef388149c9824c2194d104d4bfeadaef274f0716e8d241f
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded URLs, while some are confirmed benign, are part of a larger pattern of suspicious link aggregation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://jj-metals.com/userfiles/file/2021090202565373499.pdf In PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc9f15066e---63414559043.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/33417399453.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/64410891253.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/77071817925.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/kejomepor.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/natemewuputedomulatagiru.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/zizujolejazepus.pdfIn PDF document text
    • https://adikketiga.com/contents/files/xapodajopokisoxu.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/dufibejuv.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/161369aed0e01d---39034055791.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/161408755be842---23191278477.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/veragotuburazum.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/88918634072.pdfIn PDF document text
    • http://ciatic.saintelserver.com/archivos_editor/file/xomivegadufesodowino.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/betovunofi.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/o01athu3j5u4m4ngr11s2janbd/46650240342.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109060159432763.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/niraxuximawumejeborad.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/55090997444.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/woxerexesujadi.pdfIn PDF document text
    • http://eoffice.erdenet.mn/asu/editor/files/55263938582.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/givabegesa.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/40260409899.pdfIn PDF document text
    • https://signos.larrialdiak.es/files/galeria/files/weriva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+connect+my+phone+with+printerPDF 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_off0000b33c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB33C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB53 10452 bytes
SHA-256: 8de81d8865022571f92a3591d0d232de8b1e2de8d7ceae470632aac46e66a542
font_02_sfnt_off0000e2ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CE 16352 bytes
SHA-256: 3d6b25c167b633d7c2cee8c9df8ef43933958a22166d9340c3a7fccfbe50758b