Malicious PDF — malware analysis report

Static analysis result for SHA-256 e573839afe994793…

MALICIOUS

PDF

97.9 KB Created: 2021-07-12 22:38:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 514744ada17a90026e92b7f69695aade SHA-1: e26d7a9f9e7ce36a83c7befa86b39b4e25341cd8 SHA-256: e573839afe9947933c4c8c4f1b91898f42ea5c66fda326568d594cd24ad3bab0
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm pointing to compromised WordPress upload storage, suggesting it's designed to lure users to potentially malicious or phishing content. The numerous extracted URLs, many hosted on compromised sites, reinforce this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083211e0e9bb---kavewa.pdf In PDF document text
    • http://gursakaryahukuk.com/images/file/jeganuresozenagebevupupet.pdfIn PDF document text
    • http://spoilersmensgolfclub.com/clients/865201/File/larowunixubu.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/wizaruletovevod.pdfIn PDF document text
    • https://actor-conseil.com/files/file/gizax.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/a64b04579ea4cc4adb5a6426c970a6b5/nebem.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/23103180646.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160d0594371241---12031539102.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab85be6e8d2---kivubegigoxi.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071edb09b7d8---43108677515.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/52294896590.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/89334628553.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/86fa8abb9a3ea32dd06451d6ab2aa54b/40984143642.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16078fe7c1b466---borazika.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0b8e5190c---10319935951.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5203a8220d---tuwerexu.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/pudijidopabinoxib.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/7c729c3f8118fea3b986afffb52f194b/wigizib.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/jukowabebunapaze.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/354d2de89456fe95abaf38fbb4bc4cb7/54340827132.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab700a3511e---pudofajetasamabedibew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=chronic+blood+loss+microcytic+anemiaPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000134ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134ED 16912 bytes
SHA-256: c36aaf3c27f1cb73dbd7955f255ce9e9560da44e890f8152758557be4476d5ee
font_02_sfnt_off00016143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16143 10920 bytes
SHA-256: 68989c53f8a31a185503c4094905938c75e8072d86dd1f7749d970dbfb242d39

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