Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d6294dd75cc9149…

MALICIOUS

PDF

82.0 KB Created: 2021-09-16 23:45:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ff2675ae31c8ad3f3e91c92788678a61 SHA-1: 245786fd52e21002100c43ed3b7a83be438fb346 SHA-256: 7d6294dd75cc9149ec3a9c1db8e25f90536ff9151cc68b35bb12d044bc52c2da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farms points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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.
  • 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://medvor.ru/uplcv?utm_term=bus+game+apk PDF link annotation
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f06e32ef61---44188544888.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/makonesejajomebave.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/tedokejirafexawoti.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/89976346665.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/59914042124.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/61828321148.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/1093458424.pdfIn PDF document text
    • http://jumpstart.mobi/userfiles/file/vuxuji.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161405833aff84---41089524816.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/42797412611.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210903144746.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16140d70df2a13---jesemenumudifobaxalu.pdfIn PDF document text
    • https://pecsikult.hu/files/file/sevatijog.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/quvejoslkt5aioh2c9lt9af9i1/tegot.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109020542473990.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/15293d004d3f2450d17229b42b2c9d91/fuzalobotem.pdfIn PDF document text
    • http://micruts.org/userfiles/file/jodipibiteduje.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/19457613957.pdfIn PDF document text
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/wazugavezasaroluwef.pdfIn PDF document text
    • http://garankuccu.com/upload/fckimagesfile/3893e49152cb3c627b068c2394120dfa.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/bixeninonozuzo.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/popevos.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613f79d8e2a1d---sojebagalasomaxuxavov.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/81510193205.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210905/file/76953247756.pdfIn PDF document text
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/kewojebejesepaf.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_off0000d77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77C 19740 bytes
SHA-256: a065f4235a2cf104cab02b79eccb14b5b78741814dd6971435123cda51c9d566
font_01_sfnt_off00010b8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8C 10280 bytes
SHA-256: 6b424c19207068b80bd2e8c1ab51c7c83cd0efa86cf343a0a5cff460adb60aae
font_02_sfnt_off000122c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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