Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a544ffcf24f943f…

MALICIOUS

PDF

116.6 KB Created: 2021-10-07 14:14:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5a7d21b3df6c67ea2666c112b7306afe SHA-1: 2ea30efd01e62eeaa16df8e921ca357c90fe63e5 SHA-256: 1a544ffcf24f943f05f383fe7d6c895244df6b891ea9086e2eb40a0705a4ad42
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The PDF also hosts a link farm pointing to various external URLs, some of which are hosted on compromised WordPress sites, suggesting an attempt to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2565

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.
  • 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://synerhu.ru/uplcv?utm_term=weathering+with+you+dubbed+full+movie PDF link annotation
    • http://bulmarconsult.com/files/38900181363.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/tudimitufedarovi.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/94093315142.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/12838595884.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/75211181060.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16133a4e67264e---57733828242.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/d3b290f1007492338d27b2d22d41b83c/xonogupusemutowezefogagu.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/21159779601.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/xosonujilinodowudibafeki.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/sadunefojegilinodoga.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161522040d0562---dakuveteveruxu.pdfIn PDF document text
    • http://anhhieu.vn/hinhanh/file/somubizuvutegavawefit.pdfIn PDF document text
    • http://naturpix.ch/cmsimages/file/bamegumopufekamukifusow.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/80135230302.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/fekaxifiwezexixomakojemad.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/vatijakiboxetejo.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/29795065211.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/46839343585.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/55594626423.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/zotidememigodiverez.pdfIn PDF document text
    • http://mhzsolutionz.com/userfiles/file/katibogob.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/8893485323.pdfIn PDF document text
    • https://www.aspart.ro/ckfinder/userfiles/files/52514477222.pdfIn PDF document text
    • https://telliogluhukuk.com/userfiles/file/nasit.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161418627ba09f---78947241527.pdfIn PDF document text
    • 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_off00016c1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18431 25464 bytes
SHA-256: e36b86e3dcf315786558c323ecd2cf140920179c564d411f151f57dfd06d3ec4