Malicious PDF — malware analysis report

Static analysis result for SHA-256 de9086fc91eff961…

MALICIOUS

PDF

91.5 KB Created: 2021-08-28 20:00:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4baae779f3239129ead7df2124b10822 SHA-1: 9fab307e709b0ae46f2bf8ca79c9ac46a070a23a SHA-256: de9086fc91eff9612325dc1da05420d46bb65ba233777130dd0218cee32359da
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, it features a link farm with numerous external URLs, many hosted on compromised or disposable domains, suggesting an attempt to redirect users to malicious or phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dimensionshoppe.com/alpha/ckfinder/userfiles/files/67376738694.pdf In PDF document text
    • http://quickvideo.nl/userfiles/file/jewaberalodixejaz.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4ddec3feb---45832201720.pdfIn PDF document text
    • http://sibzakon.ru/ckfinder/userfiles/files/60344625016.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/44451426986.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/37657970687.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/bamikovolesojogumuxemotem.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/wevexogiworewewosunipex.pdfIn PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/viwozib.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d8a778fe6---69659828577.pdfIn PDF document text
    • http://escqatar.com/uploads/userfiles/file/file/retadibefaderimox.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161128df92f86d---91593256424.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e7252028f---fitoxu.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/lefefujukoloxubu.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f51e4fb32---zijowa.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/ir6amqshbi2bv05ahj6fvu4nnj/gaduvixo.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/kaguwidop.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/wozodo.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210526130739_870885124.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/61065363109.pdfIn PDF document text
    • http://hasyo.net/files/file/jelilavat.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dcd7f9b18e---46734096884.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=come+with+me+willy+wonka+lyricsPDF 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_off0000fb1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1D 10820 bytes
SHA-256: f820fbe11e5bb35a3a3ab7edc15dcfe06241c5efd88121374889ef4a1dbf7fd5
font_01_sfnt_off000113ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FF 20148 bytes
SHA-256: 0941148022d7d47b99fb2e2a3f5f72e3ad8c48797f0e392be0fbc26b4f5bedf0
font_02_sfnt_off00014857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14857 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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