Malicious PDF — malware analysis report

Static analysis result for SHA-256 42ca46737c1f507b…

MALICIOUS

PDF

89.4 KB Created: 2021-08-21 01:33:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 752acf35043ca097e3876f09c610d9ef SHA-1: 961b5c4370851b3937e168f0bbd02b0bf11e541f SHA-256: 42ca46737c1f507b94f343682b6c8913cf0ea3c16d26fda4ea31fb8f86ce0113
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3050769433---momekogabosumusoze.pdf In PDF document text
    • http://hocikto.info/userfiles/file/96697370124.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/26849302171.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/duxupuwudawaxomiziveko.pdfIn PDF document text
    • http://ducthanggroup.com/webroot/img/files/kaxovepa.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/26723483260.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/b1f8c485fccdc3b79db1407665f6a9dd/kegidelusoretewitulazudew.pdfIn PDF document text
    • http://machulski.com/public/file/18461990820.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/9702282476.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/e81191ba4495669ffd5b079089170271/lipesiziwenumev.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/tutezuwopirafedud.pdfIn PDF document text
    • https://nbretail.com.vn/ckfinder/userfiles/files/pajetofufuw.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/1rrk60ufjmpqpj8sp79po999a2/delotedavevizelatisonepap.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210717_4DF7C34B9B8F9A06.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/13222667994.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a48956e33---degevulirexudama.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/98340794582.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160760b4846d3b---10808637729.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54879091426.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/26300665164.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611975eae10ab---kujoduzesawifov.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/nitimorogamonekuxen.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/cf9b9fdfe64534c7544cb2ef7cf82679/sezejunerukuferoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=one+direction+quiz+quotev+long+resultsPDF 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_off0000f810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF810 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11027 10780 bytes
SHA-256: 8886e70c1c5ca81bdb9583ca70bb270af47c9f2cc380aec90e4fc34f7b5525e5
font_02_sfnt_off000128a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A8 18004 bytes
SHA-256: ed37c669c6bbb7c2fd4851616cda321662d3082b868184732ab2841184813003

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