Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bfec91f02fe5abc…

MALICIOUS

PDF

89.1 KB Created: 2021-09-01 07:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e57374fa97b6cd292e153fba7d3619b5 SHA-1: 355ce191dc7463256a0c852d6f79d218317f8c2a SHA-256: 0bfec91f02fe5abc7f9b7c35532b1f4e13b287e5525cc5365818203e8d5e1cb7
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The embedded URLs and the heuristic findings indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://ventadeterrenosurbanos.com/userfiles/file/50367914177.pdf In PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16083958958062---fupokujanonegu.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/76193468622.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/77830695513.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/07f3b9d0d8e0abea6aafb41a55586f70/manifisikamaboxebupilixes.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087fa357f588---36136370137.pdfIn PDF document text
    • https://rumusjitu.com/contents//files/56669663153.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/zikesuzifofefiluxawim.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/73188197085.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/tokuniromilukot.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/83627918887.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/hjj5ls4q3iplq07dbi2ngoosn7/bajopataroluridapona.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/voborodej.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/bq1a7cvetj24p6u59bhb3bcqq0/zudakudisagodevalagize.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/xevuditapiwoxe.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c100e6066e2---31590913670.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/1970551622.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/a11c2ca15ffabffeb29c81eb77ef3619/86006160397.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/kozasakijakuredopokasowu.pdfIn PDF document text
    • https://emmaushuis.org/pages/gopikuvovazukuvugox.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/2qta5gnp1tbimcs0ar3hto62ja/2959245444.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/27526249678.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/e6bcc68244d6907da7eb3dcbb8261808/xabapusuzesugabesebudiz.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/d19f47874d48525e4c862e0314e59a40/pesurebevof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=what+is+the+best+definition+of+ethicsPDF link annotation
    • 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_off0000f89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B4 10560 bytes
SHA-256: 3f4add71a9a7a13d9200ad306027228306b5b9ccc57de064707c0bb6e414eab2
font_02_sfnt_off000128c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C3 17408 bytes
SHA-256: 22017fb465fb6711e1ab13a7420568b3ac11661c59083247470e1a3fc863dab4

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