Malicious PDF — malware analysis report

Static analysis result for SHA-256 f04a8dceba5e0480…

MALICIOUS

PDF

93.4 KB Created: 2021-09-04 03:18:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5ca51453c778aca7acfce035869ca5ff SHA-1: 82d3eeb6974f61df14998dd7999d53266ca9211c SHA-256: f04a8dceba5e048020659b402da02d139dd4eeb0fc23ae9b2eba03c29c77a9b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It functions as a link farm, containing numerous URLs that likely lead to phishing sites or further malware. The presence of embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest this document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • 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://wastran.ru/uplcv?utm_term=ejercicios+para+no+confundir+b+y+d+pdf PDF link annotation
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6432d7a6a---63212319092.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com/app/webroot/uploads/ckuploads/files/46613619799.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edb1d7198c6---28875506049.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1090d8625---viwavaxovavesadozi.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/20500391112.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/dcdb01dfc6ef46f94061ea07d122fb15/40964152858.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/vebapimunulijakufufumaka.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/47419425143.pdfIn PDF document text
    • http://elsped.hu/files/file/66248062825.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/d8140d9da5b1daadb9e36349da79b11b/22821659789.pdfIn PDF document text
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/80346741373.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cabde18d021---97917933381.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd96580718---59475082550.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/82848990203.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608316b4ca28f---68200228131.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/rejiruli.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/17992963623.pdfIn PDF document text
    • http://hnsunnyfood.com/d/files/nikelugita.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/19d1ec15b48bf765d8c1eefb73bd6f27/gipepewodatipirejuradi.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/31686786258.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d5a503dfba4---mafogejodutupenubelol.pdfIn PDF document text
    • http://www.umadai.com/ckfinder/userfiles/files/zewal.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/zajotuximitugemiriremekib.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/livegoxejun.pdfIn PDF document text
    • http://ewinghighclassof1963.com/clients/e/e4/e4cb61fc1babc639533983e887b7272d/File/duwovasokaruv.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_off00010138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10138 20076 bytes
SHA-256: 069e83c50dc9d72217628111624c9f26e3c093f7b06bc1585fe0ca0bd9c75903
font_01_sfnt_off0001343f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1343F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014c56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C56 10936 bytes
SHA-256: 7b6da2a8b09282510a9a5a81858ecd12ad64816cb643e8725c3de5e839893900

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