Malicious PDF — malware analysis report

Static analysis result for SHA-256 3678ca1e951663c5…

MALICIOUS

PDF

86.2 KB Created: 2021-09-19 03:09:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fff4d9f119dcac937a8c835964226a2a SHA-1: 9464472e908c38aaecac38d41b65c54332b44784 SHA-256: 3678ca1e951663c57d39c2d966d742a06ee193b59ac485b63ec0c684500e785e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external links, many of which point to compromised websites or disposable hosting, indicating a phishing or malicious redirection attempt. The presence of a PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic further supports the malicious nature of these links. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://modellszerviz.hu/userfiles/file/joxarum.pdf In PDF document text
    • http://s2group.pl/userfiles/file/71147949867.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/rixaba.pdfIn PDF document text
    • http://petswithlove.com/cvsprojects/SSK/Source/2.0.0/images/files/lekida.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/68760989691.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/31218790527.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210917_0712ABC94F8E559F.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/ca56f24ae9e69c6e88c7ae21d1540d60/jesetujajumexizosobujale.pdfIn PDF document text
    • http://polenes.cl/userfiles/file/devevozakidogivaf.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/xalegisimarubenuvuvuku.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/pukafe.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/21578724892.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/59827414210.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/gogafawofuvetilazime.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/8702347523.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/31073610652.pdfIn PDF document text
    • http://hasicimosnov.cz/foto/Image/file/kiselotinu.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161318bb42ecee---zukekiweruvugizojasudol.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161454f9fe4472---ziwudelawakulokas.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161390d5381b13---fodepomerusalijobazijadi.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3e6feeff9---52451114752.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16130ca4026849---ladikefuganenejojewutekob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=new+american+standard+study+bible+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_off0000ec1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1A 17628 bytes
SHA-256: 5009e1ccbb89c9abcaf96271f2cab1eb0091c0f3712bb5e8022dc727c4bbef7e
font_01_sfnt_off0001194e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13165 11080 bytes
SHA-256: 0c4b49d41cf2ab05bbe68f25982df534c8122d977bfb341ccede698d7e767d4e

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