Malicious PDF — malware analysis report

Static analysis result for SHA-256 756c293dc5fa902b…

MALICIOUS

PDF

74.8 KB Created: 2021-07-22 11:51:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6d6769f39af45aae0adec629eea3f51a SHA-1: b962f27bdb21da0c1c800722616538595b359a67 SHA-256: 756c293dc5fa902b58772242de0a8f3175a46ffc73a96d2ca2a8fce531f05f54
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links pointing to compromised WordPress sites, indicating an attempt to redirect users to malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JS and external links points to T1059.007 (JavaScript) and T1566.001 (Spearphishing Attachment) as the primary attack vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8414

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://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/e5m52il1l1turld5vmegs46jlu/jebutizasipidopure.pdf In PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d696f53a27---31711610456.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/fd13d0fbd1febb7db68f9e81d0677f4e/gopefaresa.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/sefugazilijike.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/86070818491.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/27465757572.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6f69ded2f---nonotidulemaxarem.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/6f6037b85443cf8066f6f2fe80a90843/39242040492.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607797f724e3a---nopozuluxik.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/f4df342c708d1a0010efafc27e89f4b5/28712195493.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/15017468560.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/zavetiguxe.pdfIn PDF document text
    • http://honda-vo.com/upload/file/18360957961.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/vajifolilategibal.pdfIn PDF document text
    • http://medica-brno.com/files/gejetikuzebis.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/18881841397.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cb8d836c3f3---77685783482.pdfIn PDF document text
    • http://sillajen.com/fckeditor/_upload/file/begiwepesem.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/93e436042de912ae5a037d44da0576ca/jafoxomomomozivadex.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608620af1b8e3---21897093232.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/73610068289.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/59527767531.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/tizaxebafo.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/muleju.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/27423880735.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=head+over+toPDF link annotation
    • 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_off000109ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CA 9888 bytes
SHA-256: 5354855d06bb7af9e24bdcbe9e8bf98157c23e8c7b0218322c0044ba4cd5b7b3