Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd68777bc7f5bee2…

MALICIOUS

PDF

89.8 KB Created: 2021-08-12 21:58:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 44274fbcf7183a9eba4ddc75cab75a09 SHA-1: ee7dfdbcba001b49c5b9b4926e5e7506cc9ac63f SHA-256: bd68777bc7f5bee29413f55b9eb1b88d3dff883e5fa970d6cb9c658e819d6c3a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links to external websites, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a link with a 'utm_term=download' parameter further supports the lure of downloading software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://sushiloverca.com/uploads/files/68628639226.pdf In PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/66443030574.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/fozozexuvozoge.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/medavuvesepoda.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/serobaludi.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/66834146316.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/82362874565.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/0edc81d642d72daf0f617108dc16270c/kixususolozaterisel.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/57880757515.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160918942668cb---7241646582.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/fakokumozuwonapalepaw.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/858d9cd5ba85ad254f1c6a4c20b52481/dilunazalogedaxojozuwer.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/f799cbefb6dae210207ad5b4f7a95590/25000186582.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/99910359559.pdfIn PDF document text
    • http://normel.org/files/upload/file/nepowojo.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/mizoberepimusaxagomazasi.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/14f6127c04920563f780a1fbbbb30780/28758012460.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/81320427633.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210717174902166.pdfIn PDF document text
    • https://birudongker.com/contents//files/lusux.pdfIn PDF document text
    • http://kasargod.net/uploads/file/lizunomevagovubukedodaxix.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/67893126b5d20cb53eb35efabc33b163/laroji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=download+aplikasi+adobe+premiere+pro+mod+apk+pcPDF 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_off0000fc6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11485 10896 bytes
SHA-256: 7fc7c3bbd354dc49e6f03e77ffe8dab4e26f8bfb5b9d7234bb65dff7032bb5ae
font_02_sfnt_off00012d81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D81 16952 bytes
SHA-256: 2280baa4c36984f68c750150f6557591f5ed59f93dbe80d28158850b0bbeb45c

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