Malicious PDF — malware analysis report

Static analysis result for SHA-256 66ddde51ccf33e41…

MALICIOUS

PDF

93.5 KB Created: 2021-06-05 12:11:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: b1e338b264782a53f3f2b8f3298ffcb3 SHA-1: 6e5b13fa96ac5de601915245ae70bfe553fb9b1c SHA-256: 66ddde51ccf33e415cc3b1489f0398fce9edac241fbddbdf409707c332fc4503
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document is classified as malicious, exhibiting characteristics of a phishing and malware distribution lure. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document likely prompts the user to install a fake browser update or extension to facilitate malware installation or credential theft. The presence of numerous URLs, many hosted on compromised WordPress sites, suggests a link farm designed to redirect users to malicious payloads. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing attack that could lead to the execution of further malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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://garglob.ru/uplcv?utm_term=beboncool+android+wireless+game+controller PDF link annotation
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a49564574a8---xulopesanudapok.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/c331b9adbb3384d641a14da6ca2b0fb1/bafufipazigozodet.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/tk9e52t597gv23lbhe24od79b4/kaxifatigu.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/9df664da6218ed24b35ba2f815ac39c8/69486799129.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac94f4638a---27184033848.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608007d99ac73---paduvipojafenikipuw.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/66437625448.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/09aa66a59cdafe11bdace620ad1ecc54/11666518458.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609baadc7da07---xijotowijejeratof.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070767cce00c---lerilevukez.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/la7vb3lbmqleeempom9fgdhrj0/38085775575.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160744bba71789---8067676142.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/bfec1f6110ea25c5a4d5672de756b7d7/50041918188.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b25befecece---vajevitopajilifadis.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/situsebefosemezukononu.pdfIn PDF document text
    • http://cokhibaosang.com/media/ftp/file/63188782232.pdfIn PDF document text
    • https://agermag.ro/mm/file/35441303980.pdfIn PDF document text
    • http://amdind.com/userfiles/file/deziwejojevova.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001303e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1303E 5540 bytes
SHA-256: b5d17efc5f55868b8529b8627190e9c1cd45018bec03e723bc23cd3e89ffd61a
font_01_sfnt_off00014313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14313 11252 bytes
SHA-256: 895094e996f4d056750f54451cf5753b3186cfe607d39d4133278b05f0575ce3

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