Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb43a7f2d1495113…

MALICIOUS

PDF

81.4 KB Created: 2021-09-08 19:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3689a117415aff6440bfa1a932d2354c SHA-1: dcdad42fa0b89d726b2521c7975c115f513097ae SHA-256: eb43a7f2d1495113acce00c5cb238dfba12e0025fac33ff2c8df920c93c86184
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, indicative of a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to infer a malicious redirection pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://bushregenerators.biz/userfiles/files/fivisetanog.pdf In PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/47635950313.pdfIn PDF document text
    • https://websbag.com/uploads/files/befokakasok.pdfIn PDF document text
    • https://5ky13lu3-1251.com/contents/files/jetivuvofa.pdfIn PDF document text
    • https://ratosatu.com/contents/files/86053757799.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/didimilusarazazos.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/ligijudipojat.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/1735743248.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/87618649272.pdfIn PDF document text
    • http://vititanon.com/user_img/files/zegareruxafozil.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/ziridilofuwuzisadokexon.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/083bf1f24f139a7491ad370d528b67f4/77485783591.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/63583195607.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/refikeponuge.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/10733390310.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16135ce0f94fd4---91447251295.pdfIn PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/37054285928.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/dakibe.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/63259577312.pdfIn PDF document text
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/63584346683.pdfIn PDF document text
    • http://harlit.com/upfiles/file/veduzuliti.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe0ac45a91---74446216899.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/33579308925.pdfIn PDF document text
    • http://emusicmarket.com/upfile/board/files/5973331571.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/webemezosupukeliluxem.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210908_FF4944CAF9735085.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=maintenance+models+pdfPDF link annotation
    • 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_off0000d8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E5 18160 bytes
SHA-256: 4bf7d6f2df9d45ce642257df294e56cb5c8f7d23e556e705498767879e664c57
font_01_sfnt_off000107cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE6 10676 bytes
SHA-256: 7ed21e780571bea0ee271ef6b3c86f6c73642e85e91c55d0a7820aab8d9e0688