Malicious PDF — malware analysis report

Static analysis result for SHA-256 78c94f0a20f7786d…

MALICIOUS

PDF

85.9 KB Created: 2021-09-11 01:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: efe24f16a61fcfd5ad36e24cd7375562 SHA-1: c60c7b0221a0457d5b3f81b42d771b079fb57ef0 SHA-256: 78c94f0a20f7786ddd8f16d52ff44680f353320d40c0f26f67d0389549f1facb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, including those hosted on compromised CMS platforms. The presence of multiple external URIs and link farm heuristics suggests an attempt to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://triyoga-tv.ru/userfiles/file/vawarixuj.pdf In PDF document text
    • http://vinhthuan.com/upload/files/mewuvefavomawivif.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/jakeba.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/14137066655.pdfIn PDF document text
    • https://steammining.com/userfiles/file/54690161948.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3dfa61280---fikorukapak.pdfIn PDF document text
    • http://bakoca.hu/files/file/subisajozunudiruwe.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210907044233.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/rexafopip.pdfIn PDF document text
    • http://clerus.hu/files/file/23517039569.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/fururiwosigozotujanoxoze.pdfIn PDF document text
    • http://serting.eu/userfiles/files/difagazi.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/88605559576.pdfIn PDF document text
    • https://codecs.ro/images/file/ramugejokuv.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/12294828785.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/tezedaje.pdfIn PDF document text
    • http://potya.com/tajakepirokifuzulogalib.pdfIn PDF document text
    • http://chanhbon.vn/media/ftp/file/50170570679.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138c50c6235e---vaxeg.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/lemul.pdfIn PDF document text
    • https://marmetal.cevhertemizlik.com/userfiles/files/74963089192.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134d438d18b5---mesoxarisetadido.pdfIn PDF document text
    • https://pasarantogel2.com/contents/files/5227257338.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/22450055874.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/lovofuzoruru.pdfIn PDF document text
    • http://lepal.sk/ckfinder/userfiles/files/dusiwezenijugonuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=watch+jurassic+world+fallen+kingdom+free+onlinePDF 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_off0000e9e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E6 17324 bytes
SHA-256: b7a8e84f353f89fc042b84c1cc3ffd3b6328981ae0c9c6a7cf908fc1018d4035
font_01_sfnt_off000116c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C7 11324 bytes
SHA-256: d32496f9ea5bc7570ac77df6cf57ffcc698c1be5872864e5c7c595b881015cbb
font_02_sfnt_off00013114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13114 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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