Malicious PDF — malware analysis report

Static analysis result for SHA-256 f26ec6d94565eb79…

MALICIOUS

PDF

83.2 KB Created: 2021-09-08 07:35:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 5981f663c2a5c204aa9ce7e7557072ab SHA-1: 025320c0e851f03f26ea2b4fa05a1feb98c6114a SHA-256: f26ec6d94565eb796ff8d8bc85b5bcb66133e38c4e7d8396136737ab8cdf05b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating a tactic to obscure malicious destinations through numerous redirects and compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://medvor.ru/uplcv?utm_term=dracula+book+online+pdf PDF link annotation
    • https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/582e043a5b7dfd3877d86a0caf5ef1cf/sorubopujafiva.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-16/20210516203425852275.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/vupepawabexefetuwagos.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f77e747a7---20991890485.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210823_45CF9BEDC4E56280.pdfIn PDF document text
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/fuworawidunisigex.pdfIn PDF document text
    • http://myafmc.com/clients/a/a5/a51d49d85de18111a3d718c63a5e5081/File/99556517718.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/34870fcbc2744bc1f83fb77217fda798/56185389600.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/sexilufozurubejeke.pdfIn PDF document text
    • https://bloc-immo.com/images/51514192747.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/0f6e441f352ba7e1281fe4744b98175f/sogibomenamawikizosuri.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078b7ec2ed78---nufopuxazugasekiwaveg.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/numepibigadugopizetunez.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/kupekogara.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/darazafebewamazima.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/9bd6d763ff54f967d57356b75bf2ea54/81615877128.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/jofiwadevotososola.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/ac8736c39d47892bd99001e932a341c0/jibujufuxogigojirula.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/vq1sdc163n68t4homdd21uroh8/47637663319.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/2bo1qnlsog4pf6jpf560aobhqm/80186234640.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/9f6dc591c10975362d628c9626d7aa23/luzotixewomelowat.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_off0000e03f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF856 10680 bytes
SHA-256: b5efbc1a118cd69e3fc645f744e1c7be86cfa6bbca2644f363c9b05685e968d8
font_02_sfnt_off000110a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A8 18164 bytes
SHA-256: 46857453127b9c94dcd48e3c1ea3ffeaa7a755a7d0d441b818fd61965238aaee

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