Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d9d2a8fe0aab772…

MALICIOUS

PDF

88.3 KB Created: 2021-08-24 23:33:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 363f0e781e05a83ffdbabdb23381179a SHA-1: e1add6dd466c4433cf511a663b6526e400ba863c SHA-256: 6d9d2a8fe0aab772f05a335b81bd0784afe7d740521e1decafcff8edb45626fc
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to distribute further malware or conduct phishing. The presence of external URIs and the overall structure suggest it is intended to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://garglob.ru/uplcv?utm_term=what+does+a+black+stool+mean PDF link annotation
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/18833630367.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4c44002ba1---29288968884.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/39a5687ca5fcf8342032a1b5a53fb1f2/tatemip.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/8e9m81j74r5j0hp6cs7h9hah3f/52731370661.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/rrm404lv0leqh7r8qufsei2po8/55404550298.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/wogekozi.pdfIn PDF document text
    • http://rld-carbon.ru/file/38277709693.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/us9dbspfdhmjpeb60gl5p3rq7r/tomudikojafitijigopufes.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/49667693706.pdfIn PDF document text
    • http://championshipsportsrings.com/clients/23492/File/pelixala.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/94197371116.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/29716338276.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/36366871491.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/50388454057.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b215192089---gewex.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/23056474650.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/6afc9d68634986a8614c5a177f1d7bef/nutus.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/17389467815.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a88a40db948---12479787038.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a08c0d77ca---87435030910.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c420f3816e3---76475604730.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/gk21qrs7ssh5e9loor376f0m9l53m228/putemuzisegemijo.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/76980781982.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee7f3eb0f1---tituxoga.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b00643c3c---26765858680.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_off0000f734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF734 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F46 16268 bytes
SHA-256: 60d6dbb631255789f5f30fb43f876e6ebde924c5fe1605aa049f19f31f71b1d4
font_02_sfnt_off00013974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13974 10668 bytes
SHA-256: 32c1a8a14cfbb686b35e97b7af4e7ef77c94fa58bdd80f12087e9180363fbd9b

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