Malicious PDF — malware analysis report

Static analysis result for SHA-256 4626abe4e31826cf…

MALICIOUS

PDF

83.3 KB Created: 2021-10-14 13:00:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7761daf38b95647ca20bfa3c6dc52d77 SHA-1: a692d8a099b681c03b0973f6856adca3581979f7 SHA-256: 4626abe4e31826cf3045add9b2b4b325fec4acb6b9a5562caf970095b161f363
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous unknown URLs, a common tactic for distributing malicious content or phishing pages. Heuristics indicate it points to compromised CMS upload storage and uses disposable hosting, suggesting a transient infrastructure for malicious operations. ClamAV detection as Pdf.Phishing.Trojan further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://2-view.org/home/view/public_html/ckfinder/userfiles/files/mafir.pdf In PDF document text
    • http://dungcumaymoc.com/Images_upload/files/rixugenimoj.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/91787486049.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/24407251944.pdfIn PDF document text
    • https://4of100churchstreet.com/assets/media/files/zoranu.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/mokivalababezenejibev.pdfIn PDF document text
    • http://1111.morefriendship.com/upload/files/5352720129.pdfIn PDF document text
    • https://majubesar.org/contents/files/kilosozuzemakixepubat.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/gukidi.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/risatar.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/94205188295.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/jasitulozeroxejekuv.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/gujebavizobisirizodi.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/nibajedupubeba.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/tizixen.pdfIn PDF document text
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/30711560332.pdfIn PDF document text
    • https://agri-mal.pl/userfiles/file/fejopotikolinugir.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614747150c90d---tanidodeluriwatut.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/94963132413.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/xusuloze.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/df231be270f4ebb9044af47b0b1dff2f/37734838532.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/161538585acb73---rivevelidibidulo.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/RC0zOYPQW8A/uplcv?utm_term=consumer+culture+and+postmodernism+pdfPDF 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_off0000dcc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC2 10912 bytes
SHA-256: de1ab9aff2d444cbe8dbe1bd93d471f6fb763b2d57f09247d953a93771ad6fb0
font_01_sfnt_off0000f603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF603 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E15 19020 bytes
SHA-256: c26804c23ee81f184debecdd58c42770b46877027434ebe03418ec26df0779d5