Malicious PDF — malware analysis report

Static analysis result for SHA-256 c795bdc64d5ca921…

MALICIOUS

PDF

84.7 KB Created: 2021-08-15 05:09:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c8ec5257d20a7623415b240269ef997c SHA-1: 5aa473aee66e355a504a2c8837794d60544b4e8f SHA-256: c795bdc64d5ca921ffcce937526e0c090a845a8fff95dd28f6409bd9c6d8c80b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload directories or disposable hosting. The document body is heavily obfuscated and appears to be junk data, suggesting the primary purpose is to host links rather than display readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 https://totspotdaynursery.co.uk/ckfinder/userfiles/files/tosovepim.pdf In PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210728_47BCED31BA727121.pdfIn PDF document text
    • https://ksuskalology.com/images/file/doloviweweforapisive.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/lavimufuweboduwij.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/5f0255fd0b6cf8f1d627b28ee1e8e09e/83456479246.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/84e56f92cf4456c097201a950adaee01/59145173879.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/13191405107.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a64a3d42e7d---dezodumu.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096971ff3501---53263693065.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/16318894130.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/f00fe65fab622ef94d9b03712e422cab/vilopojixogarekabe.pdfIn PDF document text
    • http://wf515345.tw/CKEdit/upload/files/borewipuzikinumobe.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/fiwitulewozavokomexelajal.pdfIn PDF document text
    • http://dzbnf.com/upload/file///45416878774.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606f2f962533e---15459372207.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/linemewekupuw.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/69988048881.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788840696f7---3654073510.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-1/20210501182900152197.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/14630506899.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=the+theory+of+industrial+organization+tirole+pdfPDF 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_off0000e4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CC 17912 bytes
SHA-256: 5d85f394626266423c3bfc057d6162c464d199b02b413931eb9250b3ab21b50d
font_01_sfnt_off00011239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11239 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A50 11016 bytes
SHA-256: 24e037d4380a9411742169e6d1e0273e23912442fca5581f2f255eddfa7620ef

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