Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d06b85f908347fd…

MALICIOUS

PDF

83.9 KB Created: 2021-09-05 06:07:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f0cc10fc26b23c60047bcfb5ab86fad6 SHA-1: 0d29fce4479f6cce105cb42e04e022d49ce10e8c SHA-256: 4d06b85f908347fd2fac1ebc1b3f46227e4a0b88f2977926a7b919cb790dea6b
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve further malware. The document body is heavily obfuscated and does not provide clear textual lures.

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 http://esipro.lu/userfiles/file/kaletusikafisakogowe.pdf In PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e67a527f93---16894248275.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160920f2020620---73477029541.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/4fe721a47d3c324dbfc4cb44059881a9/baseterasuzarujo.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/f602742719c61bc28eb0c617f509c745/56681758226.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/43d9b94db0c1f501f0025299e51f955b/38242569668.pdfIn PDF document text
    • https://hirurgija.me//files/62887770252.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835fdf6457c---80523990738.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdd45377c6---budekikikipemud.pdfIn PDF document text
    • http://slanfusa.org/clients/47225/File/jefoziv.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/69478651992.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/gesidefawomiwin.pdfIn PDF document text
    • http://sbairs.com/datas/files/95687175082.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/vudonibalenan.pdfIn PDF document text
    • http://pritchardreunion.com/clients/81409/File/18557087490.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/tojemebazeg.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/56539987591.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/vojelogineliganat.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/janodumizu.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ae1592ea1---14999897281.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/nenogukuzibaviba.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1217595893.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=burkert+type+8692+manualPDF 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_off0000e1fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FE 18324 bytes
SHA-256: 3302594004f94fe54a1ca4629432918b7edf8266f6753274e650ba6fa105afcc
font_01_sfnt_off00011077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11077 11056 bytes
SHA-256: bb5153490eddb883bcd9a49b2759a6d50a4f96635d76aafcaf3bc1e4b23eb6b4
font_02_sfnt_off00012a4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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