Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3a33d79976e5b2a…

MALICIOUS

PDF

72.0 KB Created: 2021-09-29 13:10:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 62abd9535e5ddefbbc55051fb32803e8 SHA-1: 26e5062e5daaa1068ede7cc8528773fd1f0bfc96 SHA-256: d3a33d79976e5b2ae6ea862f3cd94a86b0e83f9bf82c33f75f1244f47435e33f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on disposable domains or compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://csc-027.com/userfiles/file/20210922234504_t8cciy.pdf In PDF document text
    • http://nato-denkmal.de/uploads/file/76169776917.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16142c193b1529---53812005263.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/42188992052.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/dopikadopipidepa.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/89701307115.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/pojigezogide.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/26522984966.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/24896359925.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/tipiweno.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/nopuzewajadokigo.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/54180722405.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/40298459296.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/tachm4kphpntl2nkob6ruk7hr3/5628596487.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/9f2a74224f133f032cd575cebc7bf457/93851019963.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/xorizoz.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/29252914564.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/kumuxe.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/denibeboparir.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/1bb76f9b11b32181a59e52715f7a27a7/13361700731.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/66290217754.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/jejonelozimusogawuxinuzaz.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/raxirufadu.pdfIn PDF document text
    • http://veitali.com/upload/files/53003460036.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/28581528060.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/nepewurinowo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=bluetooth+app+for+android+tv+boxPDF 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_off0000b2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A2 18140 bytes
SHA-256: a58f2a0ebd95d1b941a1cbe78ecbe4e2e2c08fa5e00d2e459e21cabbf59d4e98
font_01_sfnt_off0000e155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE155 10888 bytes
SHA-256: 26bf2e53705f9c17f66b468612d323f750e0640308b01a024450c5049d1467bb
font_02_sfnt_off0000fa43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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