Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9ee3c8a33155a08…

MALICIOUS

PDF

86.2 KB Created: 2021-08-01 23:01:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d821851ac8bd7551341cc89800c1d856 SHA-1: 52610e324b6c3394527f3591b43491da1adaf3d7 SHA-256: b9ee3c8a33155a0859c77d9ff0ddc62d4b359fad89b2816e61481039f387f94f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The numerous URLs, many pointing to compromised WordPress sites, suggest a link farm designed to redirect users to malicious content, likely for phishing or malware delivery. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://krisoc.ru/uplcv?utm_term=libros+para+pintar+mandalas+pdf PDF link annotation
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607def4dbc5bd---79891113696.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/s2reta4i644auiq1cn03r7lvea/wugibemuxevog.pdfIn PDF document text
    • http://budka39.ru/files/wonamajetobokupaji.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/lugikekovo.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/38091520542.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/worojif.pdfIn PDF document text
    • http://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/66705439201.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/viwiliwi.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/ledaperizotikelipiman.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/4987ac4c2aa61204662b6793339b593c/6244660003.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/cqtn08ref849hfrosl3s0b4mhi/tusetesonamakudi.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16087bedbbee32---ruvakodubolinixovowifeler.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ba222394a77---64935670400.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/61563268180.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/h7dlns017ujedupd9ljlb5n3a2/mifuwudujagorakofonalano.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/60406826205.pdfIn PDF document text
    • http://doyen.cc/images/upload/File/mijakawusoxosigonavugapin.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/sitekutumu.pdfIn PDF document text
    • http://faithleader.org/js/ckfinder/userfiles/files/64795697520.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/janukalibizetuvax.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/85685215882.pdfIn PDF document text
    • https://www.dgaspcsm.ro/ckfinder/userfiles/files/muburogubedagovuseledi.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/29826741342.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e92f5020071---devarat.pdfIn PDF document text
    • https://qqhanoman.com/contents//files/51792819107.pdfIn PDF document text
    • 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_off0000e6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000feeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEB 20616 bytes
SHA-256: 7c2246dd90c55d016b1de7d46929c9e3c2a5d3af0517711a203f0dbb1c78b233
font_02_sfnt_off00013336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13336 10624 bytes
SHA-256: d5841e24cacb4b3742fb26e30963395b79bf71cfa2aacf8019d69226eadb8356

Open this report in the interactive analyzer, or submit your own file for analysis.