Malicious PDF — malware analysis report

Static analysis result for SHA-256 021e8ccbd9f668df…

MALICIOUS

PDF

72.5 KB Created: 2021-08-28 06:33:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: bb5f39905af241b0a37c0938ed31ce5f SHA-1: 74c193473e349507b348e44c9c962d847a8f5679 SHA-256: 021e8ccbd9f668dff24faed11a530f0fb87d3e06378b4baa7379521fda7c3846
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. While no scripts were directly extracted, the nature of the links and the PDF structure indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://pk.mo/userfiles/file/47407124080.pdf In PDF document text
    • http://sung1.com/upload/files/wewag.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b03b242892f---51268068781.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/50656951919.pdfIn PDF document text
    • https://langumeistras.lt/i/File/zeximebumobefipesadasefa.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/vj9khkd23irqn44q61bcehqubh/worewemimifenavofake.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16084b0c8ced1c---69086938230.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2020a3bb4---sabuju.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ad4963820---jabixawawokalerelugasaf.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/65143467472.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3dcb20b0a---ximolitonupo.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/senux.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/07/file/xidoferibegujibulugenosi.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/1a1dcc665182f9742e7bcee119b08966/niwabofibovovalupimowun.pdfIn PDF document text
    • http://garystrike.com/clients/3/30/301ae0ed988f9237e4cb8f8c41f6cb36/File/46382559463.pdfIn PDF document text
    • https://panama4d.com/contents/files/jutoguselu.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/89785475f7c3c918c0156d57035ca2e2/75113663846.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/21127399798.pdfIn PDF document text
    • https://arzhosting.com/calisma2/files/uploads/kamunarubu.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-6-9/20210609130837159997.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/mufipud.pdfIn PDF document text
    • http://staropolski.net/Upload/file/34521496436.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16076322574ba5---wexubis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=you+are+roughPDF 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_off0000ba94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AA 9964 bytes
SHA-256: a8a5ead0ed88db260c41f0bbc2015d7868af7c304217856c461eea56de8744df
font_02_sfnt_off0000e8d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D6 16716 bytes
SHA-256: d518705aeaeb07769e23027ffad9f1d4a18520ac99a2ff2968607d27111d9a4d

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