Malicious PDF — malware analysis report

Static analysis result for SHA-256 5383eb3255686cc2…

MALICIOUS

PDF

89.6 KB Created: 2021-09-01 10:29:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: af3681d1a4a6b7263f4d29887bf4c47c SHA-1: 7473d6da155b5d21d03904ddf52bd7aec96c606b SHA-256: 5383eb3255686cc2fed83fd1717f6b0952e76c17e5078a305cd1d737c1029d54
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of multiple external URIs and a link farm structure suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://vo23.ru/upload/file/gizafutabukeralinowizaju.pdf In PDF document text
    • http://technology-mp.it/userfiles/files/40599795291.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/43560004011.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/vivobomorebavo.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/sadikuvidorirefigog.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/gqb03332b3421eup3ldr8rop72/dojofoxadi.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/8f5352a6a27994bf5492b06f8144a6c4/nididex.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1611a16fdbb006---68036645619.pdfIn PDF document text
    • http://gibisch.info/files/files/ninor.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/ae0ebd6a3e6b32dec324c796a24168ae/74099737056.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797f60a8458---kawisunalozetuzobozorunan.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/77842478265.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/tisaburedugiwef.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/40975104370.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/xadugukisilugene.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160738b4dc4cbd---kepatuxo.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c65ba0f7cc---kizekefep.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/zobofapivivolimizijop.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/33587820742.pdfIn PDF document text
    • http://sumterhigh89.com/clients/863574/File/58479882930.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/837b79b4affba33c33a5261aa8e89d95/ditil.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/4qgqrv2h8g3iemai94fri0839i/fibimerutobamijevux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=different+types+of+corydorasPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3B 16640 bytes
SHA-256: c93f61a847d7f8c5dfd5558fc050ee4e1a2a6fc488ff67a47ae98f4444101736
font_01_sfnt_off0000f2d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D0 19612 bytes
SHA-256: 8529548adbf071982ce37d320e128eefc7114493a489639c7338a6b2a5ca999b
font_02_sfnt_off000125b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B8 10684 bytes
SHA-256: 9c4b801b8e8afaa32aa3f5dc7d4867f95e436a43683dd3aed50e7481ce1d34a6
font_03_sfnt_off00013e60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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