Malicious PDF — malware analysis report

Static analysis result for SHA-256 d24ae8915a2874bf…

MALICIOUS

PDF

73.5 KB Created: 2021-08-30 16:27:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6f2af94e1a6941673e9e53678ae6686f SHA-1: f200022c8520c61c01875e6587ea50ac450d4bf2 SHA-256: d24ae8915a2874bf45e0b1cac05a9fb1d03e275a02d4aa504ea30203e8ffa98b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous compromised websites, likely intended to host and distribute further malicious payloads. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the true destination of the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/5tvr0cepksj1f2o7k951g9qna7/fopotomegewabozefa.pdf In PDF document text
    • http://architects-desk.com/uploadsfile/90316558625.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3b6f45767---wufesefiwatifa.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/vufile.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/pabekeza.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/kalolilona.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/49756654693.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/776624763b7daf65e8d9ea299e30a311/56276831909.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/2021819154574907.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44dddb89aa---35523217744.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/7a410f9e60b67f89fcd989888d0faf14/wiligipozoze.pdfIn PDF document text
    • https://businesslife.com/content/file/19090143986.pdfIn PDF document text
    • https://samsungdvm.net/upload/ckfinder/files/tibifoxaraku.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/8a5e1db1d162acd226a4e44653da5af7/fokosise.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609db96a6ae88---31440019010.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/rn3aq8smn1tj1gv7vfn5anh4h3/96486940860.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/74375703364.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607635eb28b72---tutalezavirikuragedipalol.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721e691cc10---fovujidot.pdfIn PDF document text
    • https://bak.vn/upload/files/zilebekibebubo.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/38038363029.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/rusito.pdfIn PDF document text
    • http://camptagola.com/clients/66689/File/zivafupenoduxowox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=someone+you+loved+piano+downloadPDF link annotation
    • https://rt9.rspo.org/ckfinder/userfiles/files/wodiladulaxozoruke.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_off0000c013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC013 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD825 15784 bytes
SHA-256: b1385ee830b653ff0879681105f0104537286550451177442c10aa74ffd5fc2a
font_02_sfnt_off00010053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10053 10628 bytes
SHA-256: e1a25012ef97286cb4e3034a9e8358f5ad8eba9daf5c1f8b0814b2bc2e8c86ef

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