Malicious PDF — malware analysis report

Static analysis result for SHA-256 b83782e7b0ad9a6a…

MALICIOUS

PDF

90.4 KB Created: 2021-09-19 15:24:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a05d947a7cba3ac3e86677c1a96061a3 SHA-1: 497c8f641188ed9ea28ed89a2c6982a59e16c565 SHA-256: b83782e7b0ad9a6a75cd698a04cd1e401bf0fc5eecc0a932518d2e28f1dfe466
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://qianlong99.org/ckfinder/userfiles/files/85640184830.pdf In PDF document text
    • https://drhuanghair.com/uploads/files/202109020842459421.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/wazofobemarun.pdfIn PDF document text
    • https://o-dance.com/upload/files/13501751779.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/21842731323.pdfIn PDF document text
    • http://handgun.ee/media/file/pesuvofupasewo.pdfIn PDF document text
    • http://khachsansapa.vn/webroot/img/files/vamuxegegi.pdfIn PDF document text
    • http://asja.ua/userfiles/file/91334126556.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613723772c311---18899576615.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/161457ebc00eaf---nigija.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/megavedinap.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613833d3d88ea---87776800671.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/zidudolikasipotilo.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/606ffd6544cbba1a2581927ac96e9062/lipewekijidaxevolunej.pdfIn PDF document text
    • https://birudongker.com/contents/files/46426052635.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142588f4b29b---41364638439.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/ff8ca2c9bb8f2fc793991b2615208b10/dejufovumevexonu.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/xarivabaxudovasovoni.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614691b357d5d---kifajerarejolufuse.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-12/images/files/64772757024.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/najabuxatelewivuf.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161465c3bd9fe9---pulut.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/rarebirejuwufonubolurag.pdfIn PDF document text
    • https://softwebstar.com/shop/userfiles/file/lalajebezu.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/52096128258.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/kavakaridu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=where+can+i+watch+the+social+dilemma+moviePDF 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_off0000fd25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD25 10780 bytes
SHA-256: 2be7c5b0f98e5727b93ab18999437ae318416aea3fde65ce67b7c78eb83f4193
font_01_sfnt_off000115d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D9 17728 bytes
SHA-256: 99ed2030461d74b878047a0f692e88cd0f677eff8e57d0c6f12c7538d66b8265
font_02_sfnt_off00014335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14335 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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