Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cb686e8cddbad17…

MALICIOUS

PDF

91.8 KB Created: 2021-07-15 14:22:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f96907973f4a7acb18e3bb53f83d56c5 SHA-1: 3e0408b9ebd5d8eabd7d91bf8ece52271a239286 SHA-256: 7cb686e8cddbad1756d84b80a1fbc26e24924be919a0c52f498c306ca3c5be5a
124 Risk Score

Malware Insights

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

The file is a PDF identified by ClamAV as a phishing trojan. Static analysis reveals it functions as a link farm, containing numerous URLs pointing to compromised WordPress sites. These links are likely intended to lure users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4398

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://duext.com/wp-content/plugins/super-forms/uploads/php/files/27a3e45b5df7952e431550c509ebada1/pobonodolifusepekurazod.pdf In PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c546ceee7---36099911816.pdfIn PDF document text
    • https://ridersshop.it/file/28253544620.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/zikijifimiduv.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/44877177084.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/jagezirowinetidifefob.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/lizuwoson.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16094e41c1f68a---memubupufigibupeveso.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/banubonizepex.pdfIn PDF document text
    • http://monktonlionsclubkidscamp.com/clients/9/99/99b8b5517e5fb663501b7ee5137ebf55/File/wefoledatezalulas.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/9227ad8363598c41a212a61961b7aaf6/pedumugezoxilumafarinifa.pdfIn PDF document text
    • http://lucavolpicella.it/userfiles/files/kijer.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084353c00aa0---marat.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/oermau5b021vq8030ou384jsc7/liweditagobefikeron.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608362eae968e---widomujajujomu.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/fomotudolejotepotufozali.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/losaje.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/93078332899.pdfIn PDF document text
    • http://lohsclassof70.com/clients/3/31/31ca850ff086a58b81c8700e10a01852/File/dufiwopod.pdfIn PDF document text
    • http://bonsaichik.ru/images_uploads/files/2708329082.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb963a7a246---lumapavezitela.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/97c8fd692908a4d3e319fa6ecc7539e0/25188441436.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=significance+of+the+number+50+in+the+biblePDF link annotation
    • 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_off0001116a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001297c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1297C 17840 bytes
SHA-256: 40cc0ba9f01f74ba6dc0ed763180f6ebd26441a3bef080a3750407d18e0dff6b
font_02_sfnt_off00015808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15808 11188 bytes
SHA-256: 5676846ef9cb2f8faf296dcbfdac074a855261552bdc520ba5236990aafa6585

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