Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9eff50b62a482be…

MALICIOUS

PDF

69.9 KB Created: 2021-09-24 07:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 23ca329c316e91e9cf3656c8d8daca87 SHA-1: 4d2b3d146bdbe7daa994d9b425064130f2e77ed4 SHA-256: e9eff50b62a482beed31960afec098748d9e92af572998fd5545274430664afb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan distribution vehicle. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI links and the overall structure indicate an attempt to lure users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://chcial.ru/uplcv?utm_term=android+kunjappan+full+movie+download+tamilrockers PDF link annotation
    • http://nbc.com.vn/ckfinder/userfiles/files/36862467833.pdfIn PDF document text
    • http://unibeauty.com.br/ckfinder/userfiles/files/4593464133.pdfIn PDF document text
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/97909368587.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161385707f0c7e---81891491161.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/52849265263.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/60504535332.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/fii0nc1vrbi4eiaslf4fkbtiuo/lopedukuvanun.pdfIn PDF document text
    • http://wwsm-us.com/files/file/fixadidisavinulibijel.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/pelaw.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/zexeperovokanodunoxa.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/89048756736.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f6391ca68---64087418234.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/2674480147.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/6554b5b14ccbb8fd0e86480498276d1d/48458396933.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae8a574564---37188454843.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/vorubunozegepikagujujupo.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/72389747056.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/mafupimadegigemoda.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/77742311380.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/72208101233.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/jilid.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/75442062174.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/8069524777.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/metexezavovaf.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_off0000b3a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A6 14348 bytes
SHA-256: 33dc9cae6b74bad031f1ef414bf5f1da82da850a2fd9803815cffac265931399
font_01_sfnt_off0000d6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FF 11236 bytes
SHA-256: 14b4cc2434b97edf87352a62d09e9892cc0e6713bc0d9801b35b0bda5c80a6de
font_02_sfnt_off0000f167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF167 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1