Malicious PDF — malware analysis report

Static analysis result for SHA-256 97d0cd45ef48a4fd…

MALICIOUS

PDF

121.8 KB Created: 2021-07-24 20:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1f3cf49575931e72290d93a24d9227e7 SHA-1: 877d2c206504327feb1339c840c3bd06372fc8ba SHA-256: 97d0cd45ef48a4fd7d94d8df3cefcd29122409bce57f0979c4b5200f6dc8332e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress upload directories, suggesting a link farm designed to host and distribute malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6b655c988---lefutas.pdf In PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c920e4b17---nenibor.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/88857021873.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/tixesevebefij.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094686d3836e---bufokim.pdfIn PDF document text
    • http://torgoborud.org/images/file/97695374894.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/tawowegowakom.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/90958847227.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc69b06bee---26930515521.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/ofh9ndnuieo6lpdipie3thftcr/54340306891.pdfIn PDF document text
    • https://botroul.be/uploads/11870754737.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/7a5f9760949cd80c04a08fa449a2b645/basibezonademepov.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/42323760795.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/76981371964.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/44nqr8lnkj58sj4vatf8lk3lms/37537196310.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d90365b62---70133520718.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/zejidevegupimumarudedixe.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3fdb7cfa98---62658207726.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/hi720di3pl77elggd8ud9e7ak6/tamelam.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/ranigifezipolagot.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3da10f64f---25232656117.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/tuzudape.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/pedobijuxisus.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/91b05ce1030937d40ac51ddd96563a70/digafizasefugidasamibepet.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/3f17ad0c4e270ed941500974d79ba7e5/99804854246.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=lectura+actividades+de+lectoescritura+para+primer+grado+en+imprenta+mayusculaPDF 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_off00017257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17257 19816 bytes
SHA-256: 4f09fd00d5eef0af34959aa24292c200ea0a719fc88791a46d5f1015a207b521
font_01_sfnt_off0001a3e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A3E9 11096 bytes
SHA-256: be57af178978d894128bbf7a0f4557ca2f86f743d34bb9c07150ba6e88b13385
font_02_sfnt_off0001bd97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BD97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1