Malicious PDF — malware analysis report

Static analysis result for SHA-256 859772592d60acd7…

MALICIOUS

PDF

81.3 KB Created: 2021-09-23 07:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 37db20a5f9c522e260e702d4e2df65e1 SHA-1: 0463c2c46fc0829f2f19111de6567be6c80c3618 SHA-256: 859772592d60acd77ca47c97a0bbccf1b40090643112e3b4c48f6670dbdba259
204 Risk Score

Malware Insights

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

This PDF document contains embedded JavaScript and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document attempts to trick the user into installing a browser extension or update. The embedded JavaScript likely facilitates this by executing malicious code or redirecting to malicious sites, potentially leading to credential theft or further malware deployment. Multiple URLs were extracted, some pointing to compromised CMS uploads and link farms, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/40966547277.pdf In PDF document text
    • https://wangwangcamp.com/uploads/files/202109082153288067.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/89752866591.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/jofupavepatavolos.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/45562019062.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/d94f949b8ab0d0ad831fbbe92404232d/wimulugufoxujolowegi.pdfIn PDF document text
    • http://dharkaninternational.com/survey/userfiles/files/palodaxeziwara.pdfIn PDF document text
    • http://azizolace.cz/images/file/kejadufe.pdfIn PDF document text
    • http://ducthanhtam.com/uploads/userfiles/file/vosusotipevuz.pdfIn PDF document text
    • http://umartravel.com/files/54247017888.pdfIn PDF document text
    • http://akcompany.vn/uploads/userfiles/file/wifovajarasezorogujugok.pdfIn PDF document text
    • http://yibetter.com/data/files/ruzerepaf.pdfIn PDF document text
    • http://vladekoservis.ru/files/fuwerajovolojevusakigegul.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/fukigovizunipom.pdfIn PDF document text
    • http://domuran.pl/files/file/25179760919.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///wulilujitexasike.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/21429470203.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/1bbeb1b1e517ea6f4449b779b25e0288/76501125120.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/dukikofiz.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/493414451.pdfIn PDF document text
    • https://4wheelchile.cl/admin/uploads/file/14207125239.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/lujujikoneresapane.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/724a01eea14f84d6b242f2b06042aada/6048323610.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/faxanusinuzul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+check+deleted+chrome+historyPDF 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_off0000d881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD881 10652 bytes
SHA-256: e3acb8b0d5ad03198e9fb89983a3f7ea5941181c3966ccb241efb09086cc3ba5
font_01_sfnt_off0000f0ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EA 18400 bytes
SHA-256: 014818610449b1355e8fb102faed209f6e8fd800153c3792b6f3bb843f655d09
font_02_sfnt_off00011fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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