Malicious PDF — malware analysis report

Static analysis result for SHA-256 43dc6c50d8134bb0…

MALICIOUS

PDF

77.2 KB Created: 2021-09-05 13:50:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a91cd98b5116c765fc4919c8a04cb4d6 SHA-1: 9af54f8327b9d1ee86cc1f2b97d2a61d088e012a SHA-256: 43dc6c50d8134bb0e155eb1f8263271892bff8c5172792be77ccd5633d54fc37
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to compromised websites, indicating a phishing or redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to download further malware or engage in fraudulent activities. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the PDF as a link farm on potentially disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f76045a4dde---jitunilanupegefosojuw.pdf In PDF document text
    • http://rucodelniza.ru/userfiles/file/ginon.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/c300f4e6d4ffb0e64b8fc948e53773cf/16714379353.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/namiganoguganinivim.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/aafb1b238d213c5537befb92423efb3f/84220252574.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210530_A8CABA6374E60751.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/12296264869.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/a5fcfc106549229059d9265cacce56a3/fiduxaxof.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/dekefaxipiwon.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/morudemaveluzajuxi.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/16562790678.pdfIn PDF document text
    • https://kangaroovietuc.vn/webroot/img/files/87214974706.pdfIn PDF document text
    • http://noithatphathuy.com/Images_upload/files/28390648434.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/81139349974.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021072016301077.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/mavejipuvuzafov.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7d116b78f---7261530492.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dde6d5acc01---15855174797.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5014bae5b---bagavo.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074acc661d01---befimotedisovenog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=handbook+of+swarm+intelligence+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_off0000c7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF6 17436 bytes
SHA-256: af2106271d24827fe7e35715b6ce4716f85bc73df4acb003ac61d97ad4be95ae
font_02_sfnt_off00010d45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D45 11272 bytes
SHA-256: f721b50262a00f361e802a193b904812f5cca191c6ec0e40335ec638f52d3b6c

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