Malicious PDF — malware analysis report

Static analysis result for SHA-256 f256be9c954d8e45…

MALICIOUS

PDF

68.8 KB Created: 2021-09-27 10:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5bfc951ceafbac6e82f651f0bb34f0f6 SHA-1: cef2b3704695133005c90ffe783a7770ef78e8b4 SHA-256: f256be9c954d8e4582624c5c830abe1a8e2d438b56777d547c7914bdcfc636be
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and numerous external URIs, many pointing to compromised websites or disposable hosting. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicates a link farm hosted on compromised CMS uploads, suggesting an attempt to disguise malicious links. The embedded JavaScript likely facilitates the redirection to these malicious sites, potentially for phishing or malware delivery. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pistant.ru/uplcv?utm_term=vsco+x+mod PDF link annotation
    • http://bjerkelunden.org/content/files/userfiles/file///galev.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/15099148836.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16140f8d3a0f79---5854358587.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/bilimorujudo.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e878a95e8---12313300634.pdfIn PDF document text
    • https://hotelcorona.ro/files/zimevax.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/19708520485.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder/userfiles/files/ratememozekevixawadugino.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/80902907574.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/jivixerumoge.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/52267154324.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/kuxadawuj.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/80672413924.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/37884285713.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/33427819570.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614df6bdc85b1---93377794466.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/rejunuwinimuxosovozi.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/vivijefivatidobewaxosobu.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/zapasepidonale.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/pavivom.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/72791189976.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/35edc99629b8bcb76d6c43a5911a6857/83187641026.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_off0000b038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB038 9868 bytes
SHA-256: f161e61bc85110d8947af61b3626c716cdb1aab6f58ec5f0ae3f13b1103ea5a1
font_01_sfnt_off0000c5f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F3 15752 bytes
SHA-256: 02d18c7bf2f17625f6f9ab2986013d302b5b1ce1d5449f9981cd362b1555353c
font_02_sfnt_off0000edd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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