Malicious PDF — malware analysis report

Static analysis result for SHA-256 c47b3b68bf8a2079…

MALICIOUS

PDF

91.5 KB Created: 2021-09-22 15:47:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8197e5613effbe7b1d92a571bbcb5ad1 SHA-1: d7d2e382036cbec498fc5c6307147a118f4325d0 SHA-256: c47b3b68bf8a2079524d103e4d95361270e99c354d4373a08799eabefed157e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, some pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 6

  • 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
  • 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 https://chcial.ru/uplcv?utm_term=hecorat+screen+recorder PDF link annotation
    • https://oncallanatomist.com/ckfinder/userfiles/files/xadimuxida.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/vorabete.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/56757722827.pdfIn PDF document text
    • http://jonellchem.com/upload/files/numati.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ziwow.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/nanisofasubugotix.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210921110152.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/92281616215.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16144308c938fd---zopowam.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/38278364288.pdfIn PDF document text
    • http://archbot.pl/files/file/91763838652.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/72468232947.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/3869204740.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/32654118487.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/49172640639.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/95687715715.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161310de994798---wofolowat.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/66066412146.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142c51a87277---56825571771.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/weduk.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/titiruzilexubuwu.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/nensrkq9u0qniu2o28jeoc4ie0/41712408257.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/82321339823.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/0kv55sng04mhujdfe546o7r2i0/26512769176.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3e5896551---51071373478.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/59938700433.pdfIn PDF document text
    • 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_off00010457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10457 10216 bytes
SHA-256: a34482cdc082110c686d33adc29e8177bd4379c42bd9fba2e08f0304b53d5785
font_01_sfnt_off00011b5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5C 17420 bytes
SHA-256: 890222650e574cf77974b8e859d48b8a2de6f138e9e11b0719ce4738b4ab9f73
font_02_sfnt_off0001485b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1485B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1