Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2de79ae406a5114…

MALICIOUS

PDF

91.5 KB Created: 2021-09-17 11:27:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 58daeba2a6a33e7461d7b1fdb7bcdaa9 SHA-1: 7415db7af81bd2b2db67a93a190f8a2a400f0180 SHA-256: c2de79ae406a51141087d9f2f146214d9e5380bf37f6959c6587789fa1d4dd09
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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://philabc.ru/uplcv?utm_term=origins+fire+staff+upgrade PDF link annotation
    • http://xinyaoqiye.com/upload_fck/file/2021-9-11/20210911171010993996.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143d7c09087b---munuwevapekuji.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/16914432389.pdfIn PDF document text
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/64118435523.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/87565966089.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/bukodig.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/1b8b3cc4937a0c5310aa476b9ee686d9/futemotaxovisuzasole.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/qec0s7hvioqboq9t1rn4k35i5k/lijemawirono.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364ea8ddac7---20712664482.pdfIn PDF document text
    • http://julianina.de/upload/file/varaluzijami.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/67422841249.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/86743985929.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/9cd939d3246937e8470769c0c0704e1d/bomadixarosagasi.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/87697687104.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210915/files/20210915162520.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16142e8267c224---ferowumajimejaf.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/11572240100.pdfIn PDF document text
    • https://parc-hotel.info/file/81938509418.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jexowufaruvirowot.pdfIn PDF document text
    • http://robbes.nl/media/files/fufejalana.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/99054609191.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/degori.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/nogogorufetulotirog.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/59570672241.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210910012321_1gbrgj.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/6387288432.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/xaxasokojif.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_off0000fe20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE20 10632 bytes
SHA-256: b67be24bf8b92e90a07c2ff290d96b13c4a63b3de9335f83e53487c667d9b072
font_01_sfnt_off00011669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11669 18984 bytes
SHA-256: 4b769fa8152845d31534e66d72aac119da0afd8682870db150ca5e1831049f58
font_02_sfnt_off00014806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14806 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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