Malicious PDF — malware analysis report

Static analysis result for SHA-256 cda4da6c0fc7024b…

MALICIOUS

PDF

91.5 KB Created: 2021-08-06 19:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fa535ebf8d56b0232cc6bed57958ebd8 SHA-1: f82b60044e2985b620f9103c854a2a5ec16c7760 SHA-256: cda4da6c0fc7024bb6e7d5b22289e22d16e6a4a0a21ed9b5a9d18fb62885ff54
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress upload directories and disposable hosting domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6966

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://rudolphalexander.com/uploads/files/87427950790.pdf In PDF document text
    • https://synersys.fr/contenu/file/17246991546.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dc4d1daa925---jevusoruxumanuvava.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c61b234162d---75672170216.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-3/20210503010906318619.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/jugudanef.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160abb8fc90be3---66456675826.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/76051820792.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/63918769184.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/62985885999.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610c4dcd88506---4347611118.pdfIn PDF document text
    • http://josephlillianmorrisfamily.com/clients/59960/File/79879804765.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/waturo.pdfIn PDF document text
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/q4o6sbt5hv1699ohfel291q355/gibarupapa.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/27751116837.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wavugonulut.pdfIn PDF document text
    • http://kodemari.info/data/files/51883761712.pdfIn PDF document text
    • http://kap-group.com/ckfinder/userfiles/files/bididuwadinek.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/jigiganisuduwuxove.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa50d8e4ab1---12792589013.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608eefcfecd36---nakodinesebasonogex.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210607_A7F67A6972CFB1FB.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=actividades+de+verbos+irregulares+en+ingles+para+imprimirPDF 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_off0000f833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF833 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001104a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104A 11144 bytes
SHA-256: 7d526f2cec91b7903ae4cce251d7b70eb61bffe3500bc54f508b2e87c1ad499a
font_02_sfnt_off000129e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E5 16760 bytes
SHA-256: 8061fceac36dae9a65a975b7058140348afa6a4255d64d5fb1af9ac18d65e5fc

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