Malicious PDF — malware analysis report

Static analysis result for SHA-256 c51e40c56ea143c5…

MALICIOUS

PDF

87.4 KB Created: 2021-10-05 17:30:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2d65d6c61fc951e9c526075e62551e7a SHA-1: 56ddfa75276dde8d0503fe8b56779638b68cf8a1 SHA-256: c51e40c56ea143c549e099b18fc2f28e150af9cade8370d75c09046d030c4a6c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised WordPress sites and disposable hosting, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of external URIs and link farms points towards an attempt to redirect the user to malicious content, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://coretry.ru/uplcv?utm_term=8+month+anniversary+quotes+for+boyfriend PDF link annotation
    • http://abcbyspu.com/ckfinder/images_store/files/tuvanikujewig.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/3b9f90831715d6bb6a7d63916ed81dad/dofonovelipuxesegun.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/86841146272.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/70668452835.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7eea8a893---1387696051.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-11/20210911171010993996.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b39cf97405---kinul.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16135b6e2047dc---newutelilikigojodujod.pdfIn PDF document text
    • https://sonerofset.com/userfiles/file/jajavuromerur.pdfIn PDF document text
    • http://master-vin.ru/files/file/gitafizitijosusalogi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614571b4a9bc1---vazudezi.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/73875653914.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/jivofusixolivalani.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/48407760646.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/jodixodede.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/wivewijobon.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/61202837270.pdfIn PDF document text
    • https://ancoraeducacion.com/images/94891595252.pdfIn PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/5146730542.pdfIn PDF document text
    • http://llux.vn/uploads/files/81764879966.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/f5a5ade72b6df8dc4cd3dbdeda4e56a7/63057449406.pdfIn PDF document text
    • http://budka39.ru/files/41384801766.pdfIn PDF document text
    • https://il-gusto.com/images/file/bidejekudobetutap.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/42256139233.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_off0000ec14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC14 19064 bytes
SHA-256: 56beb163645ea2d740ae91eff97462c3c5acb9dfdaa72821d86326411d8803b3
font_01_sfnt_off00011d71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D71 11252 bytes
SHA-256: 1434af892b99c320ad9e5fb65914ee54e7e1fbcf9da92022eb05d2e0ef3b24f8
font_02_sfnt_off00013774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13774 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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