Malicious PDF — malware analysis report

Static analysis result for SHA-256 3facef21a49e8a6c…

MALICIOUS

PDF

73.3 KB Created: 2021-09-02 22:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9dc9e82cf6772fe182ce7fed6cca1f46 SHA-1: 8950d41ee3fd438e9349591520b19c071cc5ec18 SHA-256: 3facef21a49e8a6c5db4aaa5d964b3e632fa08d18f3929f4bc5909b8e065bd52
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://infrive.ru/uplcv?utm_term=nephrotic+syndrome+journal+pdf PDF link annotation
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc039985af3---79967686850.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160dbc8669b1ad---34319825299.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612486aa63363---pemisevokiziz.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/66921660418.pdfIn PDF document text
    • https://avela.md/userfiles/file/sezagesulakadepedolevijeg.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/p4moekipteg688us9ops54rk1l/44656434209.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/zakirozinobewigaxafakinib.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/38218129938.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16082ee3576869---narikuzuburebenovez.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/935b2750004fa2b65fd0889d4d40a56f/81806989423.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e62c566fdb1---7473456538.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/56d661e4c82a0c41eeba4f84ff6b1bff/fijotokupino.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/51015266512.pdfIn PDF document text
    • http://zerosquareonline.com/file/24793000195.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/punelamepa.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16128da03e478c---topobusemazirokegun.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/10034124922.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/nixopa.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/2ba7e7a9e1ef48fdb016080e65c09202/45164498553.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/44352933186.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/p3pv86dd2j4l78bqg4cmnuding/pesanamifutitapenirines.pdfIn PDF document text
    • https://aduanaldelvalle.mx/userfiles/file/54424861730.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/20096308317.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a7dd1f53814---vunig.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_off0000bd10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD10 11204 bytes
SHA-256: e9f3b250d594928db72d51728b671fa988e11d8d3adf4725f9c1a566c06f5a1e
font_01_sfnt_off0000d717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD717 15824 bytes
SHA-256: b34f31e09b12d5a5eaae6d5fe4f892b08265459b368f00599004f20c05ab24ea
font_02_sfnt_off0000ff89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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