Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cb6f94eed254ddc…

MALICIOUS

PDF

85.7 KB Created: 2021-09-18 09:47:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 37ed71d52c82197428e0cf76505f22db SHA-1: be6932113b86fa861aaf93f9db325f0722cd8ec9 SHA-256: 9cb6f94eed254ddcdac8214d50053dfadc0f29703f3e2db1a527f9a6595586cc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs, some of which point to compromised WordPress upload directories and use SEO-redirecting terms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via a link farm. No specific malware family could be identified.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/pevobixavalezoborapurosi.pdf
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/24157373818.pdf
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/medejo.pdf
    • http://hijoin.hu/editor_up/7328710499.pdf
    • http://foto-preiss.at/upload_files/files/fosowugazuverojer.pdf
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/waliluvipotajotew.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613be8b5e277d---mofaxesurazilagat.pdf
    • https://profesa.net/userFilesfile/32264809464.pdf
    • https://beautifulhairstore.com/upload/files/jejimelosugiduvi.pdf
    • http://dynamic1984.com/user_file/file/37828869529.pdf
    • http://kor-ra.ru/UserFiles/file/noxaxen.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1e8c9c137---fedusofoluxijodidaveloko.pdf
    • http://fzcce.com/aimgs/uload/files/rufutitigugud.pdf
    • http://szyoujin.com/UploadFile/file/20210912101335785.pdf
    • http://kaizousha.com/js/upload/files/48077047787.pdf
    • http://roberlo.cz/www/files/file/49059884131.pdf
    • https://swapnauraan.com/ckfinder/userfiles/files/97306801011.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16131c5e3ed73f---67736209184.pdf
    • https://www.iieng.org/editor/ckfinder/userfiles/files/nuliguretawiliwizexem.pdf
    • https://marikakozmetika.hu/editor_up/39761322281.pdf
    • http://vividconcept.in/userfiles/file/vovedi.pdf
    • http://finance-bulldog.cz/UserFiles/File/zonedubi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=free+games+gta+5
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaf7.bin
2aaae5d61fbf28809e0647e1259587f47819e43d0e34da6d547593a5ccbd2d3a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF7 10200 bytes
font_01_sfnt_off000101ed.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x101ED 16792 bytes
font_02_sfnt_off000119ff.bin
1ea0918e0b6bcada7f2810f95d4c6ec75bcb7201c8ad9e49f60eee7b9e5dedea
pdf-font-stream PDF embedded font (sfnt) at offset 0x119FF 18256 bytes