Malicious PDF — malware analysis report

Static analysis result for SHA-256 c83e6016c55725fb…

MALICIOUS

PDF

93.5 KB Created: 2021-08-13 07:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9ea5051fb8cf878ee822ba81647412c0 SHA-1: 28c29c239ead9164ffc0c85bbcd5780306accfd5 SHA-256: c83e6016c55725fbaf8b4a7ceb0324b40191c8484944d06f7fc83f82d072a061
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous external URIs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of multiple PDF-specific heuristics related to URI farms and compromised CMS uploads strongly indicates a malicious intent to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=how+much+money+can+you+make+in+hospitality+management PDF link annotation
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1610a7aaeb2e6f---kimadiso.pdfIn PDF document text
    • https://fid-data.fr/app/webroot/uploaderfiles/25775343394.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/zomexugezomiwiwavuburaro.pdfIn PDF document text
    • https://malayalamfoundation.org/admin/my_files/file/96325919328.pdfIn PDF document text
    • http://potya.com/vupegolopavawoki.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f727c51aac---zujaxotixufole.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160cad7990e422---todavuvuweduwurezak.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/99505749251.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/xasaxajozata.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210727182837.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/15141326924.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/jutudovakupis.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075445b92f32---fupod.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610d8dec8834b---69447879893.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/e8ejcknn9h1429f38j5ibr9uh1/dipaxefibapobidarofoki.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/g9skbe0clturgjet9f2ccdqf77/23473582770.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b8824165817---96832497556.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0982bb750---25979706800.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/24189420908.pdfIn PDF document text
    • http://utopiasacramento.org/clients/0/07/071cdeedc048305be324eb10ab8031d4/File/juvijoredepowusekumoba.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/44832517931.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/memukifetipep.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cb3032cb516---43399851035.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e6eedc4e4---rasorowa.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_off0001080d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12024 11104 bytes
SHA-256: fdc43d5e4de4fcde4f3c5e72f9bfc241a58f6afbdf81141dd41afafe594e8fd5
font_02_sfnt_off000139ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139EC 17404 bytes
SHA-256: 52f2b8522a71aa1f3841e42ec5ab0267b7a528fa5f22dce3e12d75954808925d

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