Malicious PDF — malware analysis report

Static analysis result for SHA-256 2badf63d243c0387…

MALICIOUS

PDF

80.4 KB Created: 2021-09-08 16:14:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0909790d9f5f77dff03bb8d663f23241 SHA-1: 0d59cdabdff3873c5531d14c527af71a03c9d81f SHA-256: 2badf63d243c0387413e62fbc40704386455728e64c6fe06d6b0acb4b2312305
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The embedded JavaScript likely facilitates the redirection to these malicious sites, aiming to deceive users into downloading further payloads or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • 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://ibshospitals.com/userfiles/file/tiwakutigobopudujo.pdf In PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/timetuxutime.pdfIn PDF document text
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/pazozezexafiminofa.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/79201756370.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/59572178520.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb909dae42---72242773270.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137ec4b252d7---25179410637.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109050136022393.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/sogubetepinikivepija.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/leferarisujaximimor.pdfIn PDF document text
    • https://tepihtrava.rs/files/buduvezuwejuzekaxe.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/wotusogaketiwagolineke.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/fujijinuwikovuladif.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/8c599fcdcd5f049c436ee251ee960803/fujizuruj.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/xamavosu.pdfIn PDF document text
    • https://peperita.it/writable/public/userfiles/file/barofor.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/regugos.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/9255007138.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/pirirutuze.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/vumatofofudedatalusapole.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=legrado+complicaciones+pdfPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/81e7f202fc80e1480ce2760e31a4363c/ragami.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_off0000d2a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB6 19316 bytes
SHA-256: 8e4281dbb2c5d665e54bbb4a92e2c74daff5f31a8e655deeb5ae517c37132464
font_02_sfnt_off00011baa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAA 10820 bytes
SHA-256: cb5761e8fbcf562791ccf88797d54a2d3a29ce79d992c3bd79db23a60d46a758

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