Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3fd5b99074b9b0f…

MALICIOUS

PDF

82.4 KB Created: 2021-09-15 21:53:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: eb2f3a5095f752c0b5f6fb4c3d450dfc SHA-1: 0920d1209c892e9077f6993dc576534d640eca89 SHA-256: d3fd5b99074b9b0f3d4f27e020405b474713385ddace4ca78ea03911efcb57b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the true destination or leverage compromised infrastructure. While no scripts were directly extracted, the ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.jancsoalapitvany.hu/ckfinder/userfiles/files/jetavosi.pdf In PDF document text
    • http://bajcsidavidfoto.com/_user/file/33518923384.pdfIn PDF document text
    • https://datenglagi.com/contents/files/7943002124.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3ee1d25e1---togijifopebibikag.pdfIn PDF document text
    • http://aptwash.com/userData/ebizro_board/file/kinusat.pdfIn PDF document text
    • http://boki.hu/editor_up/17275914154.pdfIn PDF document text
    • https://teater77.nl/userfiles/file/fokabupegaxuwapajegukeni.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/ferevumizakuzag.pdfIn PDF document text
    • http://tion.hu/upload/file/wofozepujinogovuk.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/talubadagakode.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/2745029746.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/52849265263.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/rugabewitarepikesuzilus.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/xarexezazubigapa.pdfIn PDF document text
    • http://vetcarefoundation.org/userfiles/file/68030424724.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/bugefi.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed8aa15b52---nesexuwumutuxubunexagi.pdfIn PDF document text
    • http://kunbot.com/upload/files/taxofujuwitugevipago.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/7283608995.pdfIn PDF document text
    • https://grancom.by/upload/docs/12422979273.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/dorefub.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/58444183501.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/7m4kajfigedu8sruga3pq65d3q/71567981930.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/52639668000.pdfIn PDF document text
    • http://jamones-luna.shopcloud.es/ckfinder/userfiles/files/4289130704.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+install+external+apps+on+firestickPDF 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_off0000d820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD820 19440 bytes
SHA-256: c8e0ad6bdc2dab4fbcb1bd6e7d7cb4b1a534980c3838c378ced0900e7631afaf
font_01_sfnt_off00010aa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA0 10744 bytes
SHA-256: 21251ca066200e99de4f82dd57f39dab431a839ceb8f6361b20f1de7d471af80
font_02_sfnt_off00012388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12388 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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