Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ec2b8d842dbd7e3…

MALICIOUS

PDF

80.4 KB Created: 2021-09-19 11:45:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 655a9eaa39541584cc4eb5d82da78a8d SHA-1: f9bcf7b2470ff6c9f6f195b8905015f148e7f3d2 SHA-256: 1ec2b8d842dbd7e326e33d45383396d464f17aeed03e8bdd5f209f35899bff2f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many of which point to potentially malicious PDF files hosted on compromised or disposable domains, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://estoniapools.com/contents/files/tegabilopinapajowefuvezis.pdf In PDF document text
    • http://transgusto.ch/userfiles/file/woxumuraxupebojosodev.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/07b07a515c60c4e8a9361224c3ebec62/xuwoxof.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/revaxobugu.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///kekugadubaxixakimabavufow.pdfIn PDF document text
    • https://unitjaya.com/contents/files/wagogofuwatalusumeduxolem.pdfIn PDF document text
    • http://jlssj.com/qianzi/upfile/case_editor/file/kelopejunererekuba.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/mugegorawujaxidilupije.pdfIn PDF document text
    • http://retailcop.ca/files/wapewikoje.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/30025428948.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130dbe211374---lotuvavipavuv.pdfIn PDF document text
    • http://www.hebrewforreadingcomprehension.com/content/kewagiramojupax.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/15504956451.pdfIn PDF document text
    • https://mimpiindah1.com/contents/files/kizuzewezimamimaxel.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/86316342559.pdfIn PDF document text
    • http://rc-modeller.se/images/file///ravepevutobaduw.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/fajakuvubateguni.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/qgl5r22h0ff1qtt795ao1ktvvv/31480599544.pdfIn PDF document text
    • https://svltv.in/userfiles/files/36850322152.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5629e1a1e---nezowolopufutifi.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/72524999359.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/8b87364314428ecf8fd71eb97c9acb0f/35296742066.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/74506501232.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=download+windows+live+wallpaperPDF 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_off0000d6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDC 18056 bytes
SHA-256: 2c63c701de4fb2f42bc665e6ada02e339315cdd69004daf092a088694607f708
font_02_sfnt_off00011cad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAD 10440 bytes
SHA-256: c29e2cf4476dfe6c06da0338429787c4bd375b7224ec44c7f9ec7db275be5576

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