Malicious PDF — malware analysis report

Static analysis result for SHA-256 04661fd18f24d3e6…

MALICIOUS

PDF

69.0 KB Created: 2021-09-07 03:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cee9a5a1c449d2f7c172c987c356da85 SHA-1: bea9426b7aa814d03825ae2151cb07fc07c435c9 SHA-256: 04661fd18f24d3e6252ee8b345d2d02dcc6281d120f81320d8622ab1b8f03f45
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it is designed to lead users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://vuadiemtayninh.com/hinhanh_fckeditor/file/tewekibisusetuveruw.pdf In PDF document text
    • http://thepnguyentran.com/media/ftp/file/30613592063.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a2184f313---bulewokejon.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/zadopevokeror.pdfIn PDF document text
    • https://kopari.hu/files/file/radozuwo.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a87b5e75d8---sodenevadavimarivow.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///keperarivoxigijadowetax.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/1914682518.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/4020141701.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609adb4212270.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/nokededifogadurul.pdfIn PDF document text
    • https://ysh.my/userfiles/file/69261230679.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/sodepo.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/muzetez.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/vowufuxafavabirizuvesu.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/83048202964.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/wasawozorekusale.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/46958412579.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/ac161701f8c486bf3bf43ad380d7924b/36924272825.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210821214702984377szgtrkl9jwib.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/14147716264.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/06711d732b2a31ba2ef7651a4898f326/fofedelalamajoviwe.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/jifubijosulufebi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=mobile+user+interface+design+principles+pdfPDF link annotation
    • 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_off0000b07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB07E 11028 bytes
SHA-256: 9028b9047889a8afa9d83e60ac5b3af1c67cf8fdf427b31685bcb57bcf737e91
font_01_sfnt_off0000c9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D6 14708 bytes
SHA-256: a237ec83dcdba36eafaed8434fe3a7be3fddaaf28b444805aa976ef6ee7fd82a
font_02_sfnt_off0000ee74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1