Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed6d91b444e7e489…

MALICIOUS

PDF

81.2 KB Created: 2021-06-27 14:51:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: f24ca67075b383316b93293641c3d803 SHA-1: 84d9ada2a6ac2514a581f80e28e9e4b0659f293e SHA-256: ed6d91b444e7e489a2866c0413c1a42911e982606d91d8a83f6f34be57640163
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous external URIs and is identified as a link farm, with many links pointing to compromised WordPress upload storage or disposable hosting. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://oniceh.ru/uplcv?utm_term=i+am+not+your+friend PDF link annotation
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160828f864544d---lodepironowak.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/9015320912.pdfIn PDF document text
    • http://debden.org/userfiles/file/74827392455.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/korufivewopezux.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5a3048b0c.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/57442972509.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/7505757949.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/153287047560b1d46ecf877.pdfIn PDF document text
    • http://flightshop.jp/images/blog//file/xopevezuxikidojikurisuli.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f72cbc2216---82274037811.pdfIn PDF document text
    • https://anfauglir.com/images/file/lemojokasobimixowarez.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/ad346954e33045dd2d23dcdae7e1dced/nenolalupeteralu.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/57d40b13aaa1e25312c132f53610bfc9/77827528587.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3fa72673c9---nufumomasinunora.pdfIn PDF document text
    • http://thebestpearsonfamily.com/clients/e/e6/e6a49a9b6fa3fb0349b1957bd02e8b5b/File/490320531.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/62b2c8f0ba8647364e9e94e0da5d5a58/boloxagufutimazope.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/d5b8a4beccd5f54934ef958c42fad726/51407463959.pdfIn PDF document text
    • http://patroha.hu/file/xixoxewujasereguli.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/27459439037.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb69ecc37e---zibimeborotabizebekawiz.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c71ee60cf2---ragexigiwak.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd696c7177d---28031804440.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b829019836---lepijetemo.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb121168b7---pifazivesadepevema.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/3ab1f9f0794968e07b38699115d3953f/87152654001.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_off0000dd2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF540 16604 bytes
SHA-256: b5d187bade247ff2431cea5e7a9cadedc44520d854086b9aa4a9e516e25deabc
font_02_sfnt_off00011fb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB3 10464 bytes
SHA-256: c59e5b9abf1545cdaf9ac2d54f704de8123a9c2d3947cdf1d7f4aab36ba2531b