Malicious PDF — malware analysis report

Static analysis result for SHA-256 dce32be33c030e20…

MALICIOUS

PDF

71.9 KB Created: 2021-08-28 04:26:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: d58d38c70fcd2c745e744cb94c51ec1e SHA-1: a9370306caaa3b60e370bedda8123773a3a74994 SHA-256: dce32be33c030e202f35100e2a4cfb554cfaec0120beff6342da0165b62fd35e
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 and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated, preventing analysis of its specific lure, but the overall pattern indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://irlanc.ru/uplcv?utm_term=which+animal+blood+is+cold PDF link annotation
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/0326768e0318c86e9ae6645f54936e17/gimatukopikunumi.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/1f122c016458955866cb77b320cbdebf/21404720973.pdfIn PDF document text
    • https://mszukam.pl/dat//file/1948532116.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a22760249b9---vitenelekitimoxigeruwaj.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/jh33b29e0seb7gu1r10729bv17/tobin.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee65f4ec182---rituwojugavibedo.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/52407537143.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/90098578586.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160891bbfb24e6---repiwel.pdfIn PDF document text
    • http://korytnica.net/data/files/90470905749.pdfIn PDF document text
    • http://hphs1958reunion.com/clients/47465/File/67560379696.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/4850776142.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/8c1f00e43741e5b69b0a6d492134e739/dujidenosenetalovel.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/59335092418.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/divikuwuze.pdfIn PDF document text
    • http://teckim.it/themes/userfiles//files/82422641157.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/56351137991.pdfIn PDF document text
    • https://renetravel.ro/images/files/jijibuwemajowagijakeze.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/25d137dfdd14eacddead57f201fc7a1a/7416262230.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/66500399843.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/28853830377.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1621838077.pdfIn PDF document text
    • http://pvhs1967.com/clients/a/aa/aa78cb05297cd93d8a9ab6bd1eb8a3c4/File/76757165498.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607d211b6d2e5---30278274962.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_off0000bbad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBAD 15020 bytes
SHA-256: 9a08fc927e2d00c11b6c523cb07c56050442f5b31b66056c12aa09fe40322ef8
font_01_sfnt_off0000e1c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D8 10440 bytes
SHA-256: 5cb753ee7eebdd4e22fd268ac7fe10688fcd868ef4b78d8f155f8f401450c6c7