Malicious PDF — malware analysis report

Static analysis result for SHA-256 57c82dbdb0bfff46…

MALICIOUS

PDF

78.0 KB Created: 2021-09-08 18:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6a130d27b691896a864e334c1421162f SHA-1: 27e8a9aa5bcc5f762c50c56d4c514abafc70e743 SHA-256: 57c82dbdb0bfff4636e5624ca1654e1c69df1ee1e0bf6ad59fafdc092970a16d
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as a phishing trojan by ClamAV. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the heuristic identifying it as a link farm indicates an attempt to direct users to potentially harmful sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4972

Heuristics 5

  • 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
  • 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://talaa-obour.com/webmisr/uploadwebmisr/file/90156436862.pdf In PDF document text
    • http://sbkf.org/files/files/6956652609.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-7/20210907083849670153.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/34248361240.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/15372654692.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/77109449170.pdfIn PDF document text
    • http://guowangcable.com/d/files/gobokakoganenegor.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/zikegarigapilesedefig.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/mofive.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090701162673499.pdfIn PDF document text
    • http://hadt.vn/upload/files/44162437670.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/25873346640.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/59181850724.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/7s6qc9vlk5octf7u2it8aa9hmj/25593972577.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/29531687247.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/gunumobumigu.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/54424814235.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161382c554540f---11380853737.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/pixavikirefax.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/tipijepobojat.pdfIn PDF document text
    • https://razredna-nastava.net/files/gutesurokumasesezoba.pdfIn PDF document text
    • http://minhanh.com/files/78548254442.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/e4dc8f0d195a2e88557b26affcea4921/mosubumakuwotad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=jk+bank+syllabus+pdf+2019PDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF374 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B86 17236 bytes
SHA-256: d3eeb99c9ca74b3fe902d3ae6aa483fd67a98827d1b4d42d722ece42fc14730c

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