Malicious PDF — malware analysis report

Static analysis result for SHA-256 e474b954896a9319…

MALICIOUS

PDF

71.4 KB Created: 2021-09-27 20:12:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6e9bed5f7217c655d551f355909247f0 SHA-1: a9a12dfaf4475b7eb4bf99ec64572bd019935e1c SHA-256: e474b954896a9319d6fe30fab366f345046beeac11439a6cf767ce92432110d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the link farm and the PDF structure suggest it may attempt to exploit vulnerabilities or redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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 http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614427b91c675---duxotimelarorofe.pdf In PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/xenidomabemu.pdfIn PDF document text
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/20897088474.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/aec183672afeb60a597fba718d8e9574/supigujuru.pdfIn PDF document text
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/lofiboku.pdfIn PDF document text
    • http://sirinthepgroup.com/userfiles/file/naradodidetaxetus.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/dufafovurolovabepajokuz.pdfIn PDF document text
    • http://pedraferro.com/files/files/kezolajotidiwuvumuwarifax.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/11179357967.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/26982255154.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/xebelakakas.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/25716004148.pdfIn PDF document text
    • http://robedecreateur.com/img/files/fokewewodubeju.pdfIn PDF document text
    • http://biomehl.com/images/content/files/52660080275.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161337f0fb4ffa---xemoxujemoruvulodowalesu.pdfIn PDF document text
    • https://corpus.bg/files/fck/file/veganaputanonig.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161497484f0edb---73402720544.pdfIn PDF document text
    • http://thewesternmist.com/userfiles/file/97158116749.pdfIn PDF document text
    • http://nayyaralidada.com/alpha/ckfinder/userfiles/files/folakelebemofisuzijaran.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/pujanox.pdfIn PDF document text
    • http://administratieindex.nl/images/uploads/zazofinebotavisasonax.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/mufajexufinevorab.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210920082737.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad1b49a358---jusokeruxoruwolakarumo.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/65113520278.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/95689937461.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/88257935701.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=windows+8.1+pro+with+media+center+activation+keyPDF 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_off0000b43b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB43B 16208 bytes
SHA-256: bb370ec9b301723fb9ce0a7418c87cfd20099cf0ea874275b57f7394640dd463
font_01_sfnt_off0000dc78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC78 11408 bytes
SHA-256: 9f1fa7140d7976105fc4dc22cb2bcaecfe95ec3c057e686ea9acb0dc3fc266aa
font_02_sfnt_off0000f758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF758 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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