Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5f2b9a468d16c2e…

MALICIOUS

PDF

99.3 KB Created: 2021-09-01 01:28:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3159a187ab59a869e15c73304bb0d6ee SHA-1: 8a5090780ac08d47c5b75215b11c65bd015cbb62 SHA-256: f5f2b9a468d16c2ee53110653e913dc16052ed3b21b3f26da7b98569d0f0fe50
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest a phishing or malware distribution intent. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://teusz.pl/UserFiles/file/39250995419.pdf In PDF document text
    • http://sostrevalli.it/userfiles/files/89021108260.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/givujesegulokidefogado.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074f8882d1c2---82454628990.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/guvum.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160db4606232ac---vejowuxopofunabigawaxip.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/51715436090.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/7aka9edn3uncsprpkka9scdd64/72324616876.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/795f9114eced1344a2c82a4f01ca3403/nigagonebe.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/70482885249.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/negulaxa.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/jomugusu.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/6150672750.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/zefabekesufojudox.pdfIn PDF document text
    • https://careoncall.in/userfiles/files/toludopafitanowat.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/34127460634.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/wemifevopumig.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/katopabimalufijezivido.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/47166243969.pdfIn PDF document text
    • http://spoilersmensgolfclub.com/clients/865201/File/13984960197.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/f60c28cec52a9ae3b78e5925d3d63b01/rebiwobileduwofijagotiwu.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/rexubapezurikomobebopusut.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/rikejekoxap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=timer+for+3+minutes+30+secondsPDF 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_off00011f4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4D 10784 bytes
SHA-256: 7b617dacbf49c2ca00e31d87eb0385341670b76775f3ad8b1c465918f1c3270d
font_01_sfnt_off00013829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13829 17972 bytes
SHA-256: 4b659d4b540d1591fd138fbb0f21b72a595c600c46b96e3ff041aa0da0cf8c30
font_02_sfnt_off00016768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16768 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.