Malicious PDF — malware analysis report

Static analysis result for SHA-256 c833b071ed490833…

MALICIOUS

PDF

81.5 KB Created: 2021-09-07 03:44:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1b2db941392168a530f357e27c2e7728 SHA-1: bbbafee8398d9a4665371cf01ea9b6e3d378aa17 SHA-256: c833b071ed49083381fe431b93c269e277bf1a6b0507d9c06c4f2f67d9c989ca
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous external URIs pointing to various domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://crysiq.ru/uplcv?utm_term=2016+honda+civic+lx+manual+specs PDF link annotation
    • https://aashianarealty.com/file/72091569614.pdfIn PDF document text
    • http://drive4smilesquebec.com/clients/f/f5/f58105ca183540932673f5bf18e62671/File/kibiloxoparatafidakup.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/2ik33t3gnpmghe6fg1jlkp04jj/jedagoladibiko.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gobex.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/161176ae8bbef6---jixipewejubuwi.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/71672364776.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a24a10863b8---8346345176.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/91f99b929d2acbaefb36a417ce27a351/38334395520.pdfIn PDF document text
    • https://cliniquemyo.com/userfiles/file/84533560655.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16074c9cb6372b---puwovelivolapopew.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/fekox.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/leparefanuwunutiwiturirox.pdfIn PDF document text
    • http://iscyber.com/userfiles/files/wedav.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc6e09fdca---97529827100.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16090a5069aecf---zedugir.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/tasemomenudadutulelagupo.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/10959322771.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/badirogijoxuwoz.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1337988759.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757ee9dd650---37897073168.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/vamimetajalapipino.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b79f638bccf---64715331746.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_off0000d911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD911 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF123 17080 bytes
SHA-256: 5e268596998597efb04952f71eff4b7f1597e2bccbf0d847f3c4ce5d8153fb70
font_02_sfnt_off00011dfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFC 11212 bytes
SHA-256: 8d8320a7748f95b6cec36b2f9c0c4f28702a2365ab218d92e5260a0dc44a3050

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