Malicious PDF — malware analysis report

Static analysis result for SHA-256 20abb536f094a447…

MALICIOUS

PDF

87.4 KB Created: 2021-08-10 05:12:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: f7c52aaecd5e28a4ad9c2167a28d56af SHA-1: fb138c5e4f1c68fcb459cc063babe853ae0565b2 SHA-256: 20abb536f094a447f7028061e2ff2bdfaddcbc2a7f8b163f993c74d1d5105992
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites. The document body is unreadable, but the heuristic firings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://confetti-seasons.ru/upload/files/25868186704.pdf In PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b5e08f0cd---43757985394.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/35243584324.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/ropoluxexuvedal.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdc7ce2c6f---doxegalazenit.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160938d4509ed8---36024539863.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/glt3hjog2187jjiaaab5gd2brj/keninigugabejexotukizaxe.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a31a871d5f---jikelezodalugurupeb.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/161057055831f4---wovafus.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f19093d3b7---dumoluxupo.pdfIn PDF document text
    • https://ancoraeducacion.com/images/74803146938.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609c64f2dc095---87159705777.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/38435620442.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608f92a265685---wekonafolapab.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/nematebenejajotomivonar.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/e9ae2da109d83a49fd27e52e7b84fb02/95377082931.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073da2828894---pifububifatavupakat.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/29570970885.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/48423652953.pdfIn PDF document text
    • https://numberonerevolution.it/file/56519415832.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/4348738345.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608749d3c506b---wegobesodep.pdfIn PDF document text
    • https://lesura.net/userfiles/file/61842706665.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/91345978654.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=fsa+nondiscrimination+testing+worksheetPDF 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_off0000ef6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6B 10928 bytes
SHA-256: ccec7b9477ffcb4ecff6f0d709b474d2e4e9643fc395122681421f978f6897db
font_01_sfnt_off00010869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10869 17048 bytes
SHA-256: cf0ac8f37fb7ca55939c50c6ae7fffce7932547dc7cb148cd0b1dd8f01ad8cb9
font_02_sfnt_off00013511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13511 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1