Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1bafac02af3f169…

MALICIOUS

PDF

83.5 KB Created: 2021-10-08 20:21:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 53f9a7169fdcd37a05cadc560f1c1841 SHA-1: 1e6a6f13d36ac024ac857ecb99c259d2136bb4c2 SHA-256: c1bafac02af3f169bf0a74d707b3d9b164a92ac77f30457da16d9dfff9f80378
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains multiple external URIs and link farm structures pointing to potentially compromised websites, suggesting a phishing or malware distribution campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the document is designed to host numerous links on disposable or compromised hosting. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • 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://drafthe.ru/uplcv?utm_term=save+our+water PDF link annotation
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136abf494ce5---27428458802.pdfIn PDF document text
    • https://bbox.ru/images/shared/file/57102441478.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/kifipofepagovogo.pdfIn PDF document text
    • http://nadafashionbelt.com/Uploads/file/rukataxeribitirukewuko.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder/userfiles/files/21061551057.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/92484015156.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/xiruvevuwupi.pdfIn PDF document text
    • http://an-professional.ru/img/files/file/26246964958.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/99234328627.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/wusegat.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613587d1c2356---50303920570.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/95752350832.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-09/images/files/25632571299.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16151d8a46805c---zonanopapogomometuponunot.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613d62858be13---80842742520.pdfIn PDF document text
    • http://picart-personal.pl/fckupload/upload/file/welebikejet.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/9286594583.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/55719755616.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/soxuvoforololutemi.pdfIn PDF document text
    • http://omni-links.com/images/blog/file/45252600572.pdfIn PDF document text
    • https://mpksieradz.pl/upload/file/85736903596.pdfIn PDF document text
    • http://altera.ukrstroyka.com/content/xuploadimages/file/xazox.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/a5j7t10lp7ccq8j1sonj0ti6jh/33849283283.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/fetutazivibemiloto.pdfIn PDF document text
    • http://rhondachem.com/d/files/nikikoninisejatoju.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_off0000e0a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BD 10016 bytes
SHA-256: cdc8d59a50ee5560685e323158a68f1fa91e02e74f2cdb9b9bb8340ac3255802
font_02_sfnt_off00010f2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2F 18700 bytes
SHA-256: cf5f91d759f10bfdf470322c82f1b3da4f7d4eb967a28439df592c93657bdcb1

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