Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7e5996bc28e3410…

MALICIOUS

PDF

106.6 KB Created: 2021-09-07 02:02:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 15d6ffd69d4b13625693e77a6efd8daf SHA-1: 6942006a6287e02644c51cdf688c9d80fe3cc912 SHA-256: b7e5996bc28e34104ccdfbf9fb2bed0fee79e09575eaae765c981ef518be9e14
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identify it as a link farm, with many URLs pointing to potentially compromised WordPress upload directories or disposable hosting. This suggests the PDF is designed to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://ucinnovation.ru/admin/ckfinder/userfiles/files/bigekitunasapure.pdf In PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160de83f80ad54---dovipumezoze.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16087f33e7dbe2---gupinowewadedavexowase.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/suturiwoveginisima.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/gubidufinedazapuxaviri.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc52d911e6---digizoraviwu.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/mopenavolumepolezu.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/kejopalomovip.pdfIn PDF document text
    • https://mauspro.net/upload/files/bisojo.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/5a46ef615f97b9deab72448a6a1f32eb/43432513023.pdfIn PDF document text
    • https://roc.mn/uploads/files/2018035816.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdecd0607a---29217426932.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/6c5cae58d497b08f8c83a0029d119f53/tevipapekorebepasiti.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/62576804540.pdfIn PDF document text
    • https://patc.fr/imagesfile/kekejizokobararagi.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/e92698d0b63bdea69fbeaa35a311dc4b/dutoxav.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfe2a1b1a47---92130042627.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8ca0467b5---92321782101.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/c2b51b0aab699d3b662742d3f8c206ed/mulemub.pdfIn PDF document text
    • http://qca.ch/userfiles/file/62467294149.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/bofumujilubesogawe.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086265caf237---kajore.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16078983056305---vewupulorok.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/161334e5ba644a---15952953265.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=scrum+product+owner+test+questions+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_off00013bea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BEA 18268 bytes
SHA-256: a43dd46876e8d79619e0078ae2c26b52885ccecfe5c2ea19d95647833fc40ee4
font_01_sfnt_off00016b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B10 10980 bytes
SHA-256: f1f57a345d0519f7eafcdc12d897e6e1716e950fe2c556b014a1b75bfb170a8b
font_02_sfnt_off00018462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18462 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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