Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebf64c673e39d94a…

MALICIOUS

PDF

78.0 KB Created: 2021-09-04 18:18:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: aa433baf3035d1828176a7bf4ab9b04c SHA-1: d54d38f3500e7a05930728ad9615489d1ff810f4 SHA-256: ebf64c673e39d94a09c4b7e22dee34490190cb0772ed572c60319928f5000013
156 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or exploit vulnerabilities. No scripts were extracted, but the structure and URL analysis point to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/691f3ac5532315d6a6735a548cd5a14a/97196738757.pdf In PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/jtbq94d2a8upej7hnigkrlntbv/84128529887.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609410fd23ead---tedipumaxulobiwesajifig.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/nexuwexupiverip.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/tatezogerunazojofoxo.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/76381094433.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c63143e5758---vitimixajolewa.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/14086451964.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/13457414655.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864036d67c1---tesenamepekuboraropa.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-7-6/20210706070920254608.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/navufumomo.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/45216646214.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/bipokavesoxukodexofo.pdfIn PDF document text
    • http://biosite.ru/images/news/file/nozabovere.pdfIn PDF document text
    • http://ilkemymm.com/image/files/66155973234.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202107/file/29252317949.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/caf0dd02577362abb54acda20b1ea6e3/30871980733.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769cd50dc76---noxuroworobelonapu.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/99312547500.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/20358768899.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/weponim.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/87454890841.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7d53052c1---76988526473.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=manually+transfer+music+to+iphonePDF 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_off0000ca82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA82 10952 bytes
SHA-256: 42ea1d94883acaa03e9b5f253f6c33a1ac6674e3078a98e10ef6e7e9015b06ee
font_01_sfnt_off0000e3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C1 18000 bytes
SHA-256: 11fddddc1544a5f531b36a7dcbbd527f22d56371de9f9a41260a3c8721670dd1
font_02_sfnt_off00011251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11251 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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