Malicious PDF — malware analysis report

Static analysis result for SHA-256 68c00a3c1b2dfbcd…

MALICIOUS

PDF

70.6 KB Created: 2021-09-07 15:43:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1a9c6dd258d32681b46cdd6386f887d9 SHA-1: 0ec3d7825f759fadda33eb5aeced276f24186dad SHA-256: 68c00a3c1b2dfbcdb3cbf68b60c836abcdcbe1c5d7c29d958b216ebbe12f6861
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains numerous external URIs and a link farm pointing to various domains, suggesting an attempt to redirect users to potentially harmful content. The presence of embedded JavaScript further supports its malicious nature, likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6691

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.
  • 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
  • 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://inwebjor.ru/uplcv?utm_term=information+transfer+nonverbal+to+verbal+pdf PDF link annotation
    • http://hubbardfamilycircle.com/clients/62940/File/55461763857.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/90840190474.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/30993202447.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210701030740_2102776191.pdfIn PDF document text
    • http://www.eatvirukai.lt/uploads/files/5420163821.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f7dc17dfd3d---60828222537.pdfIn PDF document text
    • https://cityface.cz/res/file/wonerisebakigodifugijuku.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/0ae825530c4299297c429213583299d5/197017497.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/55769888487.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/56511274091.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/76690505579.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/14040011140.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/n6c3kbtqbcks5gq99iv9ppth5n/mamejalukusarevokamopi.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/refer.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/pilatotawenegevufidasoned.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/chpfic4vtlgl2ns0l87lk5g3n2/28180141089.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/lamutid.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/2979fe874f3cf15e5a030e73d4c011a8/judewofebaxenoba.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/812d62d46eb56b14815164c201b9a93c/guvajomuwiwamegajumujelo.pdfIn PDF document text
    • https://ms02bet.com/contents//files/9522597588.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b42d7c8c4b---sukegokogogibazitedifaj.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210805/210805112432670130e8hd1hg9l87z.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160d6476e889bb---zazifanunesoxoxekazeta.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE315 10816 bytes
SHA-256: 1c7d5e0e247a11e389f99e1997bd13b22a1cbbd9b0fa4bb6ccbd69d79ef477c0

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