Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a498a25ac722394…

MALICIOUS

PDF

72.4 KB Created: 2021-09-09 08:09:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dbeef71f9acc81252f4e91dc485ef53c SHA-1: 30b3f6bd9a87ec8b36b06b38db690e6bb7f2b63a SHA-256: 6a498a25ac7223941c5fdcb1f1356e2894b94a3ceaf88051af8cfc44755dcce1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. Several heuristics indicate the presence of link farms and external URIs, with some pointing to compromised CMS uploads. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.indoorclub-informa.com/boletines/img/file/xuvoboj.pdf In PDF document text
    • http://e68momo.com/shopadmin/upload/files/62297828427.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a75b7f1ca---lefepukaxudusebewekaji.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/gogejekidikof.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/fowutekegokogubelefini.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/zujakexef.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/wibemabawenazapok.pdfIn PDF document text
    • http://www.eatvirukai.lt/uploads/files/xasufafurisaxorup.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/sugivekososopin.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/vogoderetejinebifow.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327f530ebea---jimapo.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/zonujunagagetaxej.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/65507962201.pdfIn PDF document text
    • https://forumsevens.com/images/file/68710471469.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/kozame.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/nopusosogax.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/8408570197.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133a7c678c2d---xevipabiwed.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/nevigapefujasinirakikowo.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/kd29p15gipkdtuklrntseglq04/jotosejetuw.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613808ec7d393---4474822080.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/97932617410.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/4008723081.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/3556249bf69930df792468d6d1ceae88/vifinuledoxejawuxe.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613025f51aa29---83175290082.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/lenoxewasuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=examples+of+modalitiesPDF 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_off0000bc54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC54 10540 bytes
SHA-256: bc09339f4234fbc4cf049a4a576ada4efd99c77b542e78f50d32585f54f4732a
font_01_sfnt_off0000d45f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45F 15492 bytes
SHA-256: 88143ab33493a182f8c67f1007abbaa0bd0db68d5dc5d0ba07d80661378cb1eb
font_02_sfnt_off0000fb93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1