Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a5ab0a72a410d46…

MALICIOUS

PDF

90.1 KB Created: 2021-08-04 06:29:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a83a59270173432ed736dff1467f631a SHA-1: 71620c340812a8c385ff0c7b5229e110e62a92eb SHA-256: 3a5ab0a72a410d46bb10efe4e7519f79598b1a9f426f6726a2bd007cfb63f39e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final destination or leverage compromised infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://ketchas.ru/uplcv?utm_term=spanish+irregular+verbs+present+tense+worksheets PDF link annotation
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/c30e46365c24c7184d34e843d389f179/70517182613.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/xogizeranuduzavegegak.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/25238436475.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210705170529.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/17480735032.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/roninebozanomo.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210626221829.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/wulevebakup.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847b154a47f---fanuzogukakolebiwafa.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca3b034b9f---46059155607.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/0275961cc4a71bcd46ae08b9b7473dd0/44935081107.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b48686a89ba---lefivoripugudedafuzux.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/74875553917.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/86f5d04305a1ee0f8a6f9b4feb9cad95/wenanilofo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a0513db3d---kotelumuxibuwodu.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/6bcc17131ff9cd079ee341fb8dc2126f/33665433588.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/lelutifitun.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/2f0ae2d2f6246a9de84009c97a58b3cb/gezerunanojepe.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a965b967f4d---15004058925.pdfIn PDF document text
    • http://judge1960reunion.com/clients/873273/File/lemifopanadazabefawov.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160996ef9dfb68---fovewezisizetopuga.pdfIn PDF document text
    • 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_off0000f7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E4 11092 bytes
SHA-256: 3db2548a719d3bba87d14ad56c716b78381e7f74fd6fabb67d0eec86ed8bc717
font_01_sfnt_off0001118d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1118D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001299f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1299F 18480 bytes
SHA-256: 9e3a9b0640be1ce8040f47b5d55cd25f9ea119a74326ba93e3bed3f6ff3da769

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