Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ae0bc8aa9a79e23…

MALICIOUS

PDF

77.6 KB Created: 2021-08-14 07:44:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f89667774c3e468ec04340c99d8d33ae SHA-1: 9eeb599ab6311e557515494b9b3e30480a896bb9 SHA-256: 5ae0bc8aa9a79e23b6b2ff07820dc8fe42aa0a79c4cfb8312bbed9b49eb0219f
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities to execute malicious code. The heuristics indicate that the PDF acts as a link farm, pointing to numerous compromised websites, likely to host phishing content or further malware. The ClamAV detection and ML classifier strongly suggest malicious intent, with the embedded JavaScript likely responsible for the initial execution of the exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9080

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 http://otvorene-srdce.sk/userfiles/file/juvawunanusozefe.pdf In PDF document text
    • http://say-international.eu/userfiles/file/vejusekekanuwesopidize.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fbc452c7786---fatajatexixovawuv.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/30959113776.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/39460278955.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a073ed550---23930785801.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/97690846386.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/n4uh2gn5coig5tqg7cliag48tt/96564330840.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/41594057655.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/462c5cbf99595cc7af309ea44f41a9c2/36767347170.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/8c646f5bb9f12e066fb59b3bf5d4db53/12540913557.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/63440574162.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gijekakor.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/batesataviw.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/93024660026.pdfIn PDF document text
    • https://panificiopasticceriabattaglia.it/file/zuworel.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27d26b0f74---89759721677.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/viliwusoretajivil.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160879b062614d---rerekuxidiwod.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/4318205470.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/7377151151.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/18485200397.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/5ce5059b33a20070bc576cbf1ef74e22/pupemimapozo.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d94b20ac6d---ponekon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=car+wash+checklist+formPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6293c81aa---68032946999.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_off000120ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FF 10704 bytes
SHA-256: b2d48cd1b9194a8cec50dcef6cec9a27c584ad40bb47d97774b4358927751675