Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd1dd8c1f5c540ef…

MALICIOUS

PDF

87.2 KB Created: 2021-09-02 07:45:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: df93fbf074609b7699e5c570461d6c2c SHA-1: a81f56f239c5cbfbe451b85018ab7a1f6cee2ff4 SHA-256: cd1dd8c1f5c540ef2b59cc505f6d28aa21f531164eb40968f2d4012a7343c21c
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded links pointing to compromised WordPress sites and other domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple external URIs and a callback lure heuristic indicates a phishing or scam attempt. No scripts were extracted, but the link farm pattern is sufficient to infer a likely attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://crewmak.ru/uplcv?utm_term=burnish+in+a+sentence PDF link annotation
    • https://biharlokmanch.org/userfiles/file/pozizewaxugi.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608299676a89e---bedipewi.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/6407165299.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/63833134895.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/0anrq4mbsglsi4cc28h1i74048/watupolivumuzolabato.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca68111fbe---purasofedafusuzoke.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/narez.pdfIn PDF document text
    • http://tomnhenryanderson.com/clients/8/8a/8a1068334c160bb49438aafe8043afff/File/83873984831.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/soguw.pdfIn PDF document text
    • http://punaide.com/userfiles/files/35418278090.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/rajoxubavaki.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/roromiwapupafijanuwok.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093cc3e9aef2---lijafozamamunusuxuxemodi.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/lixokapudugi.pdfIn PDF document text
    • https://kueapem.com/contents//files/fosinolax.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/d5e7050b38f078a17da56491a4853ec9/37260792057.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609abf2ab9a74---nimogivabirafefe.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/wazakapukemuzugodafake.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/djuq5dp52gp7ptqvkboifvc1oa/57695093377.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b050fc01c41---51565309450.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210807_08845B7785F36860.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/sevalosogupokuxipujotedex.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/mikineko.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/gqjh7rcek38acaa74ciqbdbglo/mizijepegobufozebegimu.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/f900ff9e6e5b13457a8775576eb6e8f2/87470746504.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_off0000f326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF326 10312 bytes
SHA-256: da6a79f77257d5471d8184abf12013b00f1cf9f0afe992c631cdd53785fbfe91
font_01_sfnt_off00010a5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5D 16564 bytes
SHA-256: 2982c8da0634f90fdf5d5d9df01535a1b36425334b106c45ce565be8c0cc373e
font_02_sfnt_off00013540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13540 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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