Malicious PDF — malware analysis report

Static analysis result for SHA-256 c57ee01e87013297…

MALICIOUS

PDF

88.1 KB Created: 2021-09-01 21:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f5fd94752dd74c5f5ac19cc7da6ba310 SHA-1: 038c3ce1e509a9ac9cbe733d069bf22928fd4faf SHA-256: c57ee01e87013297de034df18e1646d04d487509bf97790f6e80315d4e12492e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing attacks. The presence of these links and the nature of the heuristics indicate an attempt to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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
  • 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://nomylo.ru/uplcv?utm_term=2015+power+wagon+for+sale PDF link annotation
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0978d03a8---tekulu.pdfIn PDF document text
    • http://fnathservices.com/upload/file/16492178971.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/wobodaretewirisufobef.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/16daf9cf53dc39bd4ec70f569ec0ad3e/54602194784.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16075ddfcd3b8a---matuzinegilixukabazukop.pdfIn PDF document text
    • http://asahiru-ban.com/files/files/divenexorubarekatu.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021070116125845.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/getigolaludu.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089c9b096586---26704145345.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/23ca3647202bc1809a6c20e619ffea83/30785380697.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/kuwebiwaxopoxelizubetanek.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c34e215ef8c---53998170237.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/981c70f5596e2345ad3578a048d2cbf1/mojikononiwofoduwej.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/62228527677.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/moduzese.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/12081674333.pdfIn PDF document text
    • http://chamdure.com/DATA/files/wopibuwojazamepubafex.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/wuwojugim.pdfIn PDF document text
    • http://momsystem.ru/public/file/debize.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/dudukedunutupusupumedexid.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/76099135339.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_off0000efe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE3 10760 bytes
SHA-256: 0951f2bfe318b17901cf9bf8c069e128dd0e7b9da8e3039bf6abcad6f7ca684e
font_01_sfnt_off000108ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108ED 18704 bytes
SHA-256: 6a01505a6c7e6d54a51fc4c5a6ae45352c21ee09b8c1371b9c40bd88ebcc92a3
font_02_sfnt_off00013a99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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