Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cb41c3de2afdd53…

MALICIOUS

PDF

66.3 KB Created: 2021-09-20 03:45:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2c0465f73e1cd880e1a813a4a6ce0435 SHA-1: 821b2c2069319f9bb0b3c19e68b1127888716cfd SHA-256: 1cb41c3de2afdd5310602282025e831dadc253e3cec1e4090b81d32020021126
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a link farm pointing to multiple distinct hosts, some of which appear to be compromised CMS uploads. The primary purpose seems to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6960

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://isemya.by/modules/ariol/static/ariol/ckfinder/files/92954331702.pdf In PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/28dcbdfe228d15fdba06f00158613c92/gijigefivoxuvoxo.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/32985955330.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16142d52186389---visupiriratunakawipesogo.pdfIn PDF document text
    • https://cpc-serbia.org/js/files/zelisabik.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/1683774932.pdfIn PDF document text
    • http://freetourscadiz.com/ckfinder/userfiles/files/52224707679.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/zalidunoka.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/81677978327.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/jenuvugosokeduganonaf.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/deredobibumarajuniroguj.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/6148633580.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/90151450571.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/siwebugimafu.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/pezajagofi.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/8ebd8065741443ea72b26c3f2bfb0b13/98380741581.pdfIn PDF document text
    • http://mgrima.com/files/file/kekuk.pdfIn PDF document text
    • http://garankuccu.com/upload/fckimagesfile/43393fbf8a26af3d77efe8db1bdb627e.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/92014003485.pdfIn PDF document text
    • http://knipia.com/userfiles/file/mopumapitok.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/161314c7ea3c1f---25747087522.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/kibufatuv.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/45c7192a38c02fdd2433e099e9c45c75/25064300506.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=yugioh+forbidden+memories+2+androidPDF 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_off0000e5c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C2 11000 bytes
SHA-256: da666602bb7c67b9aa31bb85ad78cbf92dcbd33e313ed5d0ced5b096baaa5969

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