Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cefe99349c20fd3…

MALICIOUS

PDF

87.8 KB Created: 2021-08-03 20:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 14b5a54511e445a3fd53c743b98aae63 SHA-1: 732eb6d76940e534ad19aad214e4a699d00db67c SHA-256: 3cefe99349c20fd3f031e76f5b1bc95323e9cd26ecd156b9cfeff363c88c2db0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier with high confidence. It contains numerous URLs pointing to compromised websites and disposable hosting, suggesting a phishing or link farm attack. The presence of embedded URLs and the nature of the heuristics indicate the document's primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nomylo.ru/uplcv?utm_term=what+does+reveille+mean+in+latin PDF link annotation
    • http://vaness-sens.fr/ckfinder/userfiles/files/rotugazodazesotumawifir.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/e0bca7f05dcb9cf162bec25c4d6dc16b/tibusezefofiziwunuzawarip.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbe5091d6ab---84274430364.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f47e39626---87806966075.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/kanukirazuwuzebom.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160867564c49df---xitenuvazisadujeso.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/7372491673.pdfIn PDF document text
    • https://nadamasristorante.it/file/34886068203.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/03577f4d954d390d892f98e36c798b26/93402146553.pdfIn PDF document text
    • http://www.sealjet.mn/pictures/files/nefusunepuk.pdfIn PDF document text
    • http://hawks79.com/clients/85064/File/705478935.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/63337074982.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/jojivepiwi.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/7frblaeo1ii8323gd86amqsr3h/21688188491.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/dujebiri.pdfIn PDF document text
    • https://zop.bg/webroot/img/content/files/67377619695.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/o4vpgfm5thk1tu2larq837v2gn/digabalik.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/likuxukupu.pdfIn PDF document text
    • http://coinmarketsuite.com/ckfinder/userfiles/files/83243378678.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/964f59a39c92c6b5e7b76d724c945377/xejudi.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160afdaab894dc---dapagavebi.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/66ae1fd1f70e08f21c496187453106db/jixudibuvujodosofagizo.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e0da3c8e2---80890593419.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/38770053082.pdfIn PDF document text
    • 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_off0000f27a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8C 18316 bytes
SHA-256: 91fc78fd0a813eadfdf324d3938dc63c395189ccaa190f4c94bf0a9274cf14fc
font_02_sfnt_off000139b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B1 10572 bytes
SHA-256: 2a8f57e2d1b80704c7ad2c829802b29e278c56e809ea9fb09a0b7d5eaeec1840

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