Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1cd5c362fab8fe7…

MALICIOUS

PDF

88.1 KB Created: 2021-09-17 00:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 931ee6aef5f45597b63a6b8e48ba8fb9 SHA-1: 882c41cb4385b18409b5e71f93adf0f915e68994 SHA-256: f1cd5c362fab8fe795d73bee28f135940bcfc4570bf68f3152a418d582b7816e
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous links to external sites, many of which host further PDF files. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content likely prompts the user to install a browser extension or update, a common social engineering tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a second-stage payload via the embedded JavaScript or linked resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://plagij.at/ckfinder/userfiles/files/24291493077.pdf In PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e70eede3d1---bemodawawesowurotapigax.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///22359267096.pdfIn PDF document text
    • http://taaltoetsvo.nl/userfiles/file/44212372333.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ed7eab89f---8311962798.pdfIn PDF document text
    • https://mediaskills.rs/files/97426966982.pdfIn PDF document text
    • https://maximaainfoways.com/WebExams/ckfinder/userfiles/images/files/72209860659.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/lorufujekinosonezoj.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/17432342744.pdfIn PDF document text
    • http://net-work.cz/data/file/miwemepudediwisetaruzu.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/fodexe.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/javulagajog.pdfIn PDF document text
    • http://111-orte.com/testarea/cwsCMSlight/media/files/91873704391.pdfIn PDF document text
    • http://cocoal.com/uploads/file/papenopozasasasatuganajof.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/26726814409.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/23347355674.pdfIn PDF document text
    • https://alaqart.atelierleuthold.ch/userfiles/files/9619828959.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/36694599502.pdfIn PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/50565583028.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613263e7d9360---gujovirug.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/df626afba745fdd18c2d92106518bb0f/xezolalezozuzo.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/nejasexikila.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/fuxumipijavojujazasubovi.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613100cd41729---85382887655.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/a2c09bcf906e553b7b006c2b156e4959/xadirolegitigujowizivasus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=chrome+not+opening+androidPDF 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_off0000f498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF498 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010caa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAA 17960 bytes
SHA-256: 8973525992de499ee8c926aa670fe3e5b2c9238e484d4ed2417c89ddd176e867
font_02_sfnt_off00013b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B3C 10656 bytes
SHA-256: 22108d6ef9d0fb191d48a963317f231d9bdade09fe510708b98f84e06fb1448e

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