Malicious PDF — malware analysis report

Static analysis result for SHA-256 9411abd6433324e3…

MALICIOUS

PDF

70.1 KB Created: 2021-09-26 19:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 8f79d119a51ef2e390c812d2eb6d7d9a SHA-1: 5950439a8f631b72fbd5cfa2f365edf0a53df786 SHA-256: 9411abd6433324e3f2d634e0939707364ad45a4d0b6c595042b90515658f9d0e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate the presence of link farms and compromised CMS uploads, suggesting an attempt to host or redirect to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb23e31f19---91010295254.pdf In PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/jodaxuruxivagewuw.pdfIn PDF document text
    • http://oa30us.com/userfiles/file/disojomavidotuwebovap.pdfIn PDF document text
    • http://ruihuitax.com/files/file/41578128028.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/7bf3b298a283b8f2b396f462ad5f1bcb/42049755526.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141cec9abd48---88509108212.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/demesewafuta.pdfIn PDF document text
    • http://normel.org/files/upload/file/66672390073.pdfIn PDF document text
    • http://hangzhou.chinatupai.com/web/js/ckfinder/userfiles/files/86029013274.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/jibiwawowizeludoxuzom.pdfIn PDF document text
    • https://medpressa.ru/files/file/80087376111.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/52005952657.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/46018320787.pdfIn PDF document text
    • https://mgs-on-track.com/app/webroot/userfiles/file/milufarilatemore.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/554af298fe6074fe02303a7170ab4cc2/sinuzosikales.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/91639611466.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614085f1357b0---52273798754.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/kesasokezox.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/1669478314.pdfIn PDF document text
    • http://simoncaulkin.com/images/3854690453.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/39974843345.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/gagiduxosej.pdfIn PDF document text
    • https://bloomeng.com/uploads/sogisonepubosetivemavegi.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/lakowi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=unblocked+games+333PDF 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_off0000b0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0FF 10836 bytes
SHA-256: 51de9b9a958c9f0720d15bf0c5f3a1506cca478ccdcd189a81846e9249c07cdd
font_01_sfnt_off0000c9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CF 16124 bytes
SHA-256: d63bf82b2005697fcd47ac90924a8e458e7e95d2578cdf747d104ed05ed51326
font_02_sfnt_off0000f336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF336 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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