Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee257502dcb8965f…

MALICIOUS

PDF

72.5 KB Created: 2021-09-06 19:55:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ed8116b84a71b9d18c597d10f150f7ed SHA-1: 51a91c5a59286b13d349bc66ef89f5af7364c664 SHA-256: ee257502dcb8965f290482307ed30e6276671156942e2842aca0ac1234d150d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious and by a ML classifier. It contains a link farm pointing to compromised CMS upload storage, suggesting an attempt to host malicious content. The presence of numerous URLs, many on disposable hosting, indicates a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF format itself can embed JavaScript for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081483fd473f---rupojevegix.pdf In PDF document text
    • https://al-wesam.com/userfiles/files/12683508397.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/89624198082.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/9atsudiln31frjgkcdnolobvp3/koxamufixodawu.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/a71ujlgi58cv31l9mqff8a9vfm/tagedo.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210819064809_ir3u9e.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/5e3c1d341104c8ad7f09a38b56c0c721/13019072813.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608250e2675a3---4886496078.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/52812966c75f3d1f3fcea78ac45eaf46/jukesapanolovisevomokofik.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/9b8d2f485054bdd091ae01190e0895fd/lavekomilewigizef.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092cf4ad0ab8---25068767523.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/tovorudewido.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/vatavumedevitukazigukaxid.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c20b9180260---51898772965.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/4427302561.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/jivunoxok.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/50209677819.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160c17839a0a1b---rasozalelagadotuxoz.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/25820224684.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e938de1cbdf---suvuvelujol.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160af7c5bd0ee4---59076163253.pdfIn PDF document text
    • http://konditsionery-zheleznodorozhnyi.ru/upload_picture/file/duliweron.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/98945318240.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=home+wiring+installation+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_off0000bb5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB5D 15536 bytes
SHA-256: da107e637b6ca30bc6e24003775a1d4174125714ec10fd234161b0b9a2aadbf3
font_01_sfnt_off0000e32b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB42 10920 bytes
SHA-256: b78b0624aecceba2fbfdb708402b7b8e0ccf9c85d10c3ebe15ad4cae53f2d2a9

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