Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebb3237edcddb188…

MALICIOUS

PDF

81.6 KB Created: 2021-09-02 05:58:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c8e78b37f015f7b7bfccbb90adf4cce5 SHA-1: caacd2bbd2cf3b2895fcfedd1a68747602510b57 SHA-256: ebb3237edcddb1880732b33e59fab6367a915deeb6097160956f547afb1e3695
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a deliberate attempt to create a network of redirecting URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://queure.ru/uplcv?utm_term=learn+html+css+online PDF link annotation
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/7a02644ef1f4dc26617d3d9a577dca3f/bekukolebej.pdfIn PDF document text
    • http://apogeeconsultancy.com/upload/files/bevananuzunawaxezime.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/9340210810.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/74822742203.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/81677677871.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/6ed969ac77ab5b1cacbc5e5d11078e6f/94932341633.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/paledebavejunivifevujoko.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/60465858692.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/riduromigibimiwujuwebad.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7a71a9923---85898567026.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/ccshdtm1q7mvu9nl5bb0khvi89/liwib.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/nijixebena.pdfIn PDF document text
    • https://epiphanych.com/images/file/zukawonetunuw.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/doruximigavakobuxejat.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ed31017e5---tabama.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/15581863153.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/33fb279c0f7d0e42339717f3d94a3727/kexevodojiz.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/99342919085.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c68a7f30c2f---kigenonufeta.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/jirawunulufulavepomu.pdfIn PDF document text
    • http://agrion.org/upload/fichier/97611694944.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_off0000db81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB81 17588 bytes
SHA-256: 8aafa21d0817b816fa13281fe5c989efb5f18e8f06c9660bd2819d097cecc798
font_01_sfnt_off0001092d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12144 10452 bytes
SHA-256: c5f8ddbbdf534f50fb7c40a0cc4d36234aaf8329deb6fcb4eb95e61e589c176e

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