Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cdcc8e5b3365af3…

MALICIOUS

PDF

58.2 KB Created: 2021-09-19 12:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 16a37cbf4963862bb95b66ae3dead0ac SHA-1: 5fb74d483917940b8e01b4feb798980b81ec444d SHA-256: 7cdcc8e5b3365af3fb7d4f72ab5b6e36971a43895d56416ae9984ad61805a0f8
162 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The embedded JavaScript is a common method for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7619

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://smidgel.ru/uplcv?utm_term=hug+day+sad+shayari
    • https://bikeid.net/ckfinder/userfiles/files/20172351022.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140a1a847676---radekumovi.pdf
    • https://centaur.vri.cz/docs/files/15879844332.pdf
    • https://pavillonwohlen.ch/userfiles/files/wovozoga.pdf
    • http://geoman.cz/data/file/81268952578.pdf
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/gefofobexefuzux.pdf
    • https://questyme.ca/userfiles/file/dururoj.pdf
    • https://phoenixturkey.com/upload/ckfinder/files/80078021463.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0b60d4d65---xapotiropu.pdf
    • http://finalstage.biz/js/upload/files/jopakatogakufow.pdf
    • https://www.vignolaweb.it/ckfinder/userfiles/files/523988373.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130521fad3fd---guradiderefuvipiriravaz.pdf
    • https://jyapa.com/jhuoyue/uploadfiles/32767183673.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/161457e5506a0d---80683105733.pdf
    • http://momsystem.ru/public/file/pisogilevovedeja.pdf
    • http://ud2-140.com/files/49026346553.pdf
    • http://mycoapaisyl.com/webimages/files/43102523497.pdf
    • http://novehorizonty.sk/userfiles/file/xupagafutupevukewe.pdf
    • https://binarbaidrealestate.com/public_html/userfiles/file/70906397126.pdf
    • http://www.samuitns.com/image/upload/File/28477113980.pdf
    • http://metalzilembo.it/userfiles/files/pasaw.pdf
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/55616911395.pdf
    • https://napraforgohotel.hu/upload/file/42453039009.pdf
    • https://kaemsp.org/upload/editor/file/mofusupegoralosikunenir.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba99.bin
6858c9fd2580a8922828f883ef539f786e7d59395f7981f34fe4f770fec58964		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA99 20320 bytes

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