Malicious PDF — malware analysis report

Static analysis result for SHA-256 b937d2520abf7caf…

MALICIOUS

PDF

93.7 KB Created: 2021-08-05 15:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 68a16dd13d566985183146ba51e8a2c7 SHA-1: 700cb839d559d3e1ff244cdeba78e04afdb74d68 SHA-256: b937d2520abf7caf5fac1d180c21020cf51d11fb031d2506c89bb024d89d13d1
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://nomylo.ru/uplcv?utm_term=como+perder+barriga+em+1+semana+homem PDF link annotation
    • https://soudurelauziere.com/upload/editor/file/488021905.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16088ea2c279d6---2614052797.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/0328f589fe3dbc495e8658d3fe9e957c/95473128207.pdfIn PDF document text
    • https://shih-tzu.ro/files/file/gojotupobujekulas.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210618/file/potadoxixokugod.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/17291553658.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/xisozexanevevawajupe.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/puparomopiguzesameseveme.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/9b21807cc7c1771e3b14147d5224d610/95064760395.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/kofir.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed2707fac4---zowerotuzumigebi.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/83160029012.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8e0317339---85122828388.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed3fdaef6c.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/1okab4blu6jits8vthls35tj10/71745238404.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/juvijikegu.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/21768372314.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/89480018895.pdfIn PDF document text
    • http://hilltop1976.com/clients/24685/File/19046311781.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/jujaburi.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a431be64819---58650458780.pdfIn PDF document text
    • https://aspirans.com/files/file/kufuw.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/sawikefumerutezi.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_off000105ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FF 19564 bytes
SHA-256: d09b979fa66fdd799046672716866bc2cc3e471f0dbad397ef9c6ca4991f9267
font_01_sfnt_off000135c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DD8 10916 bytes
SHA-256: 5404a505970ad6f232db2e754d28363ad54fe084aa3b38cff1cf538ff11b2b7e

Open this report in the interactive analyzer, or submit your own file for analysis.