Malicious PDF — malware analysis report

Static analysis result for SHA-256 237492d9d2a4841e…

MALICIOUS

PDF

77.0 KB Created: 2021-09-02 14:21:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0d73a403f42f03e2a4de365e129991e9 SHA-1: 75ab2cfddf965fe774ec5fdf6364df5bb7ede499 SHA-256: 237492d9d2a4841e40f2d46bae2e1087c42e504d265ae5b706a82012dd94568f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning model assigned a high probability of maliciousness. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads or disposable domains. The embedded URLs suggest an attempt to manipulate search engine results or direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://xenang-mitsubishi.com/fckupload/file/rubosemivepikefi.pdf In PDF document text
    • https://moolans.com/uploads/files/komagapotedodobiziz.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160709343e72fb---bewabotapajiwatejum.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/63fe241b4e8917869216e04073c62455/2567985762.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/16619912003.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/renuretitax.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/dexomuxexu.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/pegexazatunuwutofige.pdfIn PDF document text
    • http://ehs1958.org/clients/73155/File/86522046059.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/doxojokatuzesivadozopi.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/kadufusigimixodifoboboxi.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/86a7bd9f85c526ac261ca854155d9084/sikuwagitawipuzorepad.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/jaxufepojezulebe.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161216caaa0c8c---bopetavolodugodarewevuvef.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606fe25f70c53---31446763495.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/12c3ba45e2948128eae4a80ac2755d53/pikel.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a39eb254e---44284097736.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c8ebe21dd---kilonuwufojada.pdfIn PDF document text
    • http://intertribo.sk/files/jobixegoxegepibivuweker.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/24829575623.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de65dc9e60---foleruf.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/35506774722.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/98167493411.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bf929193e15---zonupidarozufiru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=msrtc+timetable+pdf+akolaPDF 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_off0000c868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC868 10904 bytes
SHA-256: 38b0771311ae6832a97b61124e9cb06abe6f1a819890dd8d7f44cb49c9a5b7e1
font_01_sfnt_off0000e17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17C 17332 bytes
SHA-256: 079ba75c049708bab4dff2587fdabd55a8a7fcb443a8bebe0556751dab5d387f
font_02_sfnt_off00010e61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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