Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d3e82d605cc4454…

MALICIOUS

PDF

70.7 KB Created: 2021-09-25 15:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a3c58c44c3343f066d74eb5c365e3db5 SHA-1: 8f0f75d01648fc253fa14d68554d2572c6fb4160 SHA-256: 9d3e82d605cc4454e73b76ccd7b04fee829b2377f44fed8f7a0155f435be140c
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 a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://philabc.ru/uplcv?utm_term=hack+real+racing+3 PDF link annotation
    • https://felicityokolo.com/file/natesunewolulezilazezumi.pdfIn PDF document text
    • http://fabrikando.com/cmsimple/images/file/webad.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/dumegituxugifupikuxeviri.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/7652498747.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16141095c8e02e---7274894491.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/bujarovodevenegudabaza.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/77351667153.pdfIn PDF document text
    • https://seger.cz/userfiles/file/15537245850.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/82913265bdf9aa429e3744eb6c8713f0/gogizesituj.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614ce8310f26b---gufefaruziwugixezasi.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613632a3affb9---50123402431.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/8478445852.pdfIn PDF document text
    • https://ajambary.com/userfiles/file/65088330057.pdfIn PDF document text
    • https://lesrimaudieres.com/images/uploads/file/82881563273.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/levufodaxisa.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/22673817413.pdfIn PDF document text
    • http://xfswchem.com/upload/files/zofegenupepiluralob.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/gadopamixuvububim.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/resuzegawigejimerixafope.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/vikupopafukasowolatanivux.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8319809fd---pabimeguxerujibar.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_off0000b087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB087 17856 bytes
SHA-256: 2e7f7a3ea4127aad7ec27eccd2719e5bbdf37efe3ffebccfdccc060a0a0fcd4b
font_01_sfnt_off0000de99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE99 10272 bytes
SHA-256: b4dd954e7258c68743386cc07e517aebba89495e49ed83c8d26f150872221ecc
font_02_sfnt_off0000f5c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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