Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d0018aa68cf7797…

MALICIOUS

PDF

74.8 KB Created: 2021-09-20 01:22:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 286fc8d70667be94f421e31e2a185e6b SHA-1: e309e53d844b7bfbef1dfdf99172c0ddb60d7cf9 SHA-256: 8d0018aa68cf77970ee63066a3a7c2819a2e3cd74563d1fd5162a15aeed0cb55
162 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, numerous links were found pointing to various domains, some of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to distribute malware or conduct phishing. The ClamAV detection and ML classifier further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7043

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 http://stin-verdon.fr/assets/Image/files/78152755913.pdf In PDF document text
    • https://hotelite.in/userfiles/file/49028560443.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/tukejirezepukekox.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/jegaxebevowovewazanis.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/5a8c880233a44ad6457409f0fedca7c9/kepatalujorakepa.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/28819186555.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///siluloletoleju.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/65c409958165086bc3b5c428f77c57da/gusewumidewotav.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/50140550870.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/d9f5540550ec6220e221ac12821fb79c/jumesipujogupavevasiba.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/332d75c4d59094f475a8b04ab760b2f0/8666222601.pdfIn PDF document text
    • http://asv-solnice.cz/_files/file/zaluvirudaxitofuzasuf.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/monotezeboxebuzabaverupag.pdfIn PDF document text
    • http://ssss-sangam.com/userfiles/file/korofulimamafelujug.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/78252906268.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161456c1e3079f---sigudomuvigukipixisawapen.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/39354113541.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/120ba977950508825c57708092a122ac/5506032529.pdfIn PDF document text
    • http://kleiberit.ru/files/file/59205820689.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/11847127135.pdfIn PDF document text
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/bawagagevusemorupuwisaw.pdfIn PDF document text
    • http://classoft.ro/userfiles/file/wagubug.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1614102e8812ed---36386905924.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/93101573679.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/tosofizikuvebuwajidas.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/28981021606.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=kitkat+now+unitedPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE3 20300 bytes
SHA-256: 2eeec5d40db39d618f31af70ea774b4e3d5e5513244deb2ff8887abed083a80c
font_01_sfnt_off000113c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C5 10196 bytes
SHA-256: 6c2dbe98f98c01783654643bb85a49a1a4239a15934d55abff090d29410d1e84