Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cbeb3d9301b053b…

MALICIOUS

PDF

83.0 KB Created: 2021-09-19 22:22:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f2a593d6121d0bb40a733725bccf402c SHA-1: 74e246a9b6d4533274720c254a5da7239af3259a SHA-256: 0cbeb3d9301b053b57513f3462bf154ec82c133b18305b352dc9a34362256376
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.corazondelsol.es/ckfinder/userfiles/files/nezadakewu.pdf In PDF document text
    • https://mimpisiluman.com/contents/files/mututubojifunanefedi.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/xefegupofilupe.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/10461523447.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/kegidemovapejesax.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/80335944237.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/1243100971.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/momezujez.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/vodise.pdfIn PDF document text
    • http://hasomedia.com/userfiles/file/70417603579.pdfIn PDF document text
    • https://sklepbonus.pl/userfiles/file/fufas.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/savawazobeza.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/2847d212b0808e909aca3deb5a2057cc/fejatefumenef.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///13024107685.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/lamipenojija.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/xorakiduro.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/4397614565.pdfIn PDF document text
    • http://smogy.ru/files/files/gasatudurijoke.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/55821478518.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/68230947780.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614309432e6e3---zegesototi.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/161398749ccf0c---zawozovozaxudaw.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/p32sc2jkivqe495a226o58csr4/nufaxaxonamamaxibuzage.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/nitakiwuxa.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/81798081161.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210919_82E05D524774B935.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=assassin%27s+creed+identity+latest+apk+downloadPDF 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_off0000d4c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C9 10812 bytes
SHA-256: 3ec990a088dc2b2b8dc80ee7a55221030b9a8cf24558d216c677cc3eb5dd7b05
font_01_sfnt_off0000edf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF5 20960 bytes
SHA-256: 9e40e72c6c60d905f7b51efa7135b9c89d75ecdf365b2ba360513526c9914edd
font_02_sfnt_off00012566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12566 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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