Malicious PDF — malware analysis report

Static analysis result for SHA-256 86a661a5b05f8664…

MALICIOUS

PDF

79.7 KB Created: 2021-07-19 07:07:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 29530b94a5272dea2ed17140a48589fd SHA-1: 6cb370ef2dc77d698ef42ecec88a11b5712f8d86 SHA-256: 86a661a5b05f86646007c191a2d9b064519a9cda2a93366ae87686375f38dc1d
154 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple compromised WordPress sites, likely to host further malicious content or phishing pages. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The embedded URLs suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5306

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://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/e1401bde4e2fe384c83ad5ca9011d09f/56243067632.pdf In PDF document text
    • http://kenshopvn.com/uploads/files/9256615674.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/3e1cdb1301ecb384dcfbff02f5294b64/57593798107.pdfIn PDF document text
    • https://yuss.it/file/jotopugibajogutekabaxatol.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/df4b0a5c53232bb4dd51ddae86cc9323/85352113300.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///vipadujogibis.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094677283b45---xufivagot.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160765c2d8e647---87550252444.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f10c0b95315---petibepuladekokovajogeda.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/14f689b5a40ba842ad15831d139df0f2/17162453349.pdfIn PDF document text
    • http://shssailors1969.com/clients/3/36/366f78b21138e0f8005dfe6cc5e09e30/File/49497527449.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c75a100fcdc---bigazokakabevusa.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/583e503d8e95243dad12cfc5673eb760/5080967010.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1bc85f5da---wesinazuku.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/jaredaxapirepimazeru.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/1e7d4de0a86044e63f5220228fcd53c9/44883258568.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/b86bd01bd4b4c6f52977d40b9538313d/pifafakezuzorumorekonalan.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b23762d4b5c---53203119009.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/pexitozedina.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/mikuni.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/1be11e6ae6455b62a1742599de4dd4e4/tidujezitimesupukineroxo.pdfIn PDF document text
    • https://vansuloi.com/uploads/userfiles/file/dawox.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/kodebegodozononexusipekuf.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a274ae28f42---ladututetitosi.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/09a5502e046774fec0500f36b4808f9c/86637682088.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=season+2+spinning+outPDF 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_off0000f761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF761 18076 bytes
SHA-256: b2ae80006d255ac084836a822cc41558f865abbeec2a180be27fb4d77943189c
font_01_sfnt_off000126d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D1 10576 bytes
SHA-256: 93a62463ea297b9a954a380216e59a73e6342b5faeebfd55a44cf48498fbf488