Malicious PDF — malware analysis report

Static analysis result for SHA-256 be6dd576e55780ea…

MALICIOUS

PDF

78.4 KB Created: 2021-09-12 17:09:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8a56024abbfadfe8bb59c1506c9f492c SHA-1: 2760420b8e3477bd6ebaf8a61bf892ca224c11f0 SHA-256: be6dd576e55780eabaa7f26d3dae59f5eb1322732b08f0fb69c829b6f6772ae6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what is inferred from the URLs and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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://drafthe.ru/uplcv?utm_term=hub+in+osi+model PDF link annotation
    • http://logisticsnetworks.net/ckfinder/userfiles/files/jididefidagi.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/95753933870.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/94392604004.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/31137995074.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/regafavuramutobiba.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/gelenumipezuva.pdfIn PDF document text
    • https://simorgh.it/uploads/file/20311011382.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/9632740894.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d47de371d1---36596881285.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136fd93e57a6---97598596693.pdfIn PDF document text
    • http://etkenkalip.com/files/68370328905.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/wutepuzagovab.pdfIn PDF document text
    • http://lawyersmarketingusa.com/user_upload_image/file/In PDF document text
    • http://nissanotogovap.vn/uploads/images/files/kogugilagul.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/f4df012d0d9530019d2fe5404c41851a/65609792572.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/januzuzizixopeminuz.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132953b6c1b5---93276034359.pdfIn PDF document text
    • https://vjlabor.pitscovn.com/uploads/Upload/files/82548632301.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/84967097277.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/gunebufamumefekavawopaxig.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/rubut.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021090503135973499.pdfIn PDF document text
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/55124792991.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109032224522228.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/17146537645.pdfIn PDF document text
    • http://k9careclinic.in/ckeditor/ckfinder/userfiles/files/vonenozuzapenefuba.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD18 1868 bytes
SHA-256: 9d2bb2d94384256bb38bab4c3005c13f44a8b25eb5b232dcefe64ad24aae4b51
font_01_sfnt_off0000c5cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dde1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE1 20724 bytes
SHA-256: ab6469bb7819b34f55a9046f76c98336cd7e697438b5bf654729259e3edccc02
font_03_sfnt_off0001132f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132F 10280 bytes
SHA-256: fc371b64bda562b019525e14b513f2e3076403b8f3c2bc65c0df334886004580

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