Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b1bb231ab86f16a…

MALICIOUS

PDF

77.2 KB Created: 2021-09-03 14:18:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b71aef6b7dfa3cfc84568d10ff4f5dfa SHA-1: 9123980e456302b2eae9b9665a0b615b8998d9bd SHA-256: 5b1bb231ab86f16a76e7801cbcd94b1e3315c86d182cb8ec94b9410014071809
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving exploitation of PDF vulnerabilities to execute the embedded JavaScript. The primary goal appears to be directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://missteenqueenuk.com/userfiles/file/xijisapivedemesadaxivil.pdf In PDF document text
    • https://le27.fr/docs/file/wumoguzugirekef.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/31e1fa094afe401afd98571ab46d8064/7380942319.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/welifagaradi.pdfIn PDF document text
    • https://produse-zilan.ro/files/tojekufoxo.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2aaf1118fb---fomisinelase.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/56786262765.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f81576469---sepukomufoxepirijir.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/58264131806.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/c380b23f9769534cc7d0044b222e5f08/62713643021.pdfIn PDF document text
    • http://controlsystemco.com/cache/fck_files/file/2865685652.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0395912001624487664.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/68099283908.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/pomir.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098845ced1ab---bajimalufukepapo.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16073e3b688342---12085131306.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/ec18b28d4a0a0b93ac0b74d560740205/38273606251.pdfIn PDF document text
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/monomazafarakifibaxilir.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/0d8f2bbd097b7472fca6503c5448b90b/lowepoz.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/49018638466.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///72427049924.pdfIn PDF document text
    • https://saam.vn/images/content/file/97909340538.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/nazufujozofikepebome.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/95542658415.pdfIn PDF document text
    • http://popmetre.com/news/files/55422635331.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=friction+coefficient+pdfPDF 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_off0000ccb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB6 10212 bytes
SHA-256: e3e746dc8c9e1eb716ecc93d74db9d8830ff7fd9390670f1019fc0ca1ba1c887
font_01_sfnt_off0000e3a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A9 16932 bytes
SHA-256: d176ebd89ddcd0ed2639139a6e1cda1587e8ddc7372f048b23d80bdc791b9e32
font_02_sfnt_off00010f10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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