Malicious PDF — malware analysis report

Static analysis result for SHA-256 83ecb2cb58e35a1a…

MALICIOUS

PDF

82.6 KB Created: 2021-09-12 11:27:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 49f1750bcdb4cab2bf1469b0973a1efd SHA-1: 81e786def3efffce01f10f7f2f0e2e902a2a5a61 SHA-256: 83ecb2cb58e35a1ac7a9a2e642ce507e65b9bede32cbeb1b0f2790dd1d1dde2e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. The document contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate that the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://smidgel.ru/uplcv?utm_term=cinema+update+firestick PDF link annotation
    • http://chrisdepanneservices.com/Sites/cds/files/55360481289.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce2bfa67b2---29893398875.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/lolikovededugowavevi.pdfIn PDF document text
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/dokozozejedodilimov.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/90436487962.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/rexuputemarokabejezevo.pdfIn PDF document text
    • http://infinity8talents.com/userfiles/file/wabozigus.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613679606c80a---bopedikifibogolofix.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613021804c096---68133466865.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613693208a3df---pexuxeganinirovonupajumu.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/49519114674.pdfIn PDF document text
    • https://esofagopisa.it/userfiles/file/gozivoval.pdfIn PDF document text
    • http://arucax.am/user_images/file/musenenama.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/xakunonulukewe.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/45580e3a90a268d5e94d6ac972c56ffa/pajomovipomikikujotofiva.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/18474862530.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/97900649759.pdfIn PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/menuwemumifamusatovetev.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/fagaminajipuniri.pdfIn PDF document text
    • https://krusomying.com/data/file/6296887493.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/48684004169.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eebe78c30b---16807946021.pdfIn PDF document text
    • http://sichera.eu/userfiles/files/84555256319.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612f73fada4ff---73268434473.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_off0000dd64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f57b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57B 10836 bytes
SHA-256: 092a61d8b6c91ed1f7753b0316e5cacf2706893c064fbdac1357ec73123676e5
font_02_sfnt_off00010e82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E82 18000 bytes
SHA-256: a57c89dfdeeb7d7d409449a53a797816676ba364dfed8756a3f9889827eebd6a

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