Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9ba0ecbc8c1bc20…

MALICIOUS

PDF

78.2 KB Created: 2021-09-05 15:30:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e70bea18fc77f3bf43a60678daff916c SHA-1: bb439361aae6c596eca1226a7e1ecda214699b0a SHA-256: c9ba0ecbc8c1bc203766e8594b7db830008fbb6c098304066cc08ba9fd8670f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of malware. The document contains a link farm with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or redirection attempt. Although no scripts were explicitly extracted, the PDF structure and the nature of the URLs indicate it is likely designed to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://studiovizia.com/webroot/img/content/files/35198568541.pdf In PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c907ec2669c---99162371841.pdfIn PDF document text
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/bixekaga.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079b1d164e0f---88880715935.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/sudijupobirakulavetope.pdfIn PDF document text
    • https://netpage.info/userfiles/file/gizazowowebuzedewukomozi.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609845932149c---54942516913.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/savorovunuzedefuvivos.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161303f1027383---54743984691.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/poviwuvezozerari.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/dibikeburufo.pdfIn PDF document text
    • https://www.casestilistas.es/ckfinder/userfiles/files/xawusozut.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/8231119992.pdfIn PDF document text
    • http://irinka.org/ckfinder/userfiles/files/47637610868.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/kanuforibafutidupizare.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/e69aa3a6bca463c6f508e85243b0dbb0/xuvikovudosaledo.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/44816630223.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/52264851448.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/25711898015.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3f450612cb---31336497792.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607303354bc2a---wufapowedujaxaxusurikorej.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160775cfe924e3---66509320467.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/ff318f28da3cf4ddff2d5b84ab374c12/mipusuwuzakapinutawev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=free+quickbooks+training+manual+pdfPDF 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_off0000ce1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1B 16600 bytes
SHA-256: 3dd82639a5a85786a17172624437da194b983b23545626106a784ca4a620eb56
font_01_sfnt_off0000f8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C2 11420 bytes
SHA-256: 8eadf74a371a26f9c0d34201d784e3325ffa4cecb9a6b47c6cb1dbe77dbf00bd
font_02_sfnt_off000112f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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