Malicious PDF — malware analysis report

Static analysis result for SHA-256 f54188c69a984b45…

MALICIOUS

PDF

77.7 KB Created: 2021-06-28 16:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8188a9d30e20aecbef2603a57f6eeda8 SHA-1: d2d63b7bd0d49a21c4ac2fe1ba633b7a915b95fb SHA-256: f54188c69a984b45db06881b783b35537925644b3673f914a09afb0dd2e0803d
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous external links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and appears to be metadata from wkhtmltopdf, providing no direct user-facing content but reinforcing the nature of the file as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/iocli551hqp4sjeddh53865o12/42768150244.pdf In PDF document text
    • https://ludifrance.fr/userfiles/file/29834197994.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ac1e24680---fijatoxa.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/5l074ftlisijet4qviv2ks19e6/makizuzavuzixovewidi.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/04kd951icp19225fudrnlmh2on/fovonutuka.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16076669cb0f5c---4175462542.pdfIn PDF document text
    • https://pasarantogeldua.com/contents//files/baledaxulekemabosepavem.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/tipapeperuxaxorolu.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/95d68ad12cc1836cce5a22e1c0b5cb7b/pimupetunigagut.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/38216085590.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160979e82daf61---81212394714.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/paruvevedugokulesoga.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/46087896580.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b10ae3465d6---xuvojogu.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/8505661002.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/33189616450.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608590a36796e---78048667265.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/98359286641.pdfIn PDF document text
    • http://hasyo.net/files/file/2039749366.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/sapokadopanubesajojug.pdfIn PDF document text
    • http://ridgefieldpark1967.com/clients/3/39/39eebdc8797e30ee23d4fd57d071fd44/File/58116050559.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7b054db00c---42870887644.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=i+find+outPDF 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_off0000d05f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD05F 9792 bytes
SHA-256: c91070c59a2d2008c09e5f4495148547bc40d74fe699dcc92a65144c0561b428
font_01_sfnt_off0000e5d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEA 17152 bytes
SHA-256: 866f4c40792678eb133a60e13af57a2cb18373c25c8e9e8da99286648a6a6b54

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