Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c148d6b2fe799d1…

MALICIOUS

PDF

76.7 KB Created: 2021-09-15 00:21:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ee8f5c283243c6aed20e81ab7080d9b4 SHA-1: 1ef0077b9bdd08938587c234b5fa5e4776b01c2a SHA-256: 9c148d6b2fe799d139501582a437813ab6a77d78018134936f4dc04901e4fdc7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many hosted on compromised CMS uploads and disposable domains, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://ketchas.ru/uplcv?utm_term=android+how+to+sync+contacts PDF link annotation
    • https://limadelimon.com/images/file/xitewapogopimeregi.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/zezajedopirusav.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613019d2314ff---wifatigusolularivu.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/20627807153.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/28323028997.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/4204802794.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/ef28abd82cb9e8fdb51442b287fcdc58/tonaba.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/wowem.pdfIn PDF document text
    • http://cy2hand.com/userfiles/9689621673.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/12496213023.pdfIn PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/21801383511.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210912010208_9m9kmk.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/7501952620.pdfIn PDF document text
    • https://snf.styleguides.ch/userfiles/files/gogizotiluwudijujomodavul.pdfIn PDF document text
    • https://vnycc.com/userfiles/file/80203309706.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/43953143049.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614111ab5b82f---batidekafelefagolomok.pdfIn PDF document text
    • http://ladna.pl/user_images/file/87718717196.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/7314087356.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9fbb739fc.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/79539474411.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/fesunotanavudetulipeze.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/petosotiwanazo.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/wibamokowirigibazat.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f1983a1b8---95263640396.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/miwigafija.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_off0000c86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC86C 17264 bytes
SHA-256: ba6c9ede4b4d49dea2f7240ac0d1765e6dd92bc6260e8b48ac26b4554629dc5d
font_01_sfnt_off0000f529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF529 10468 bytes
SHA-256: 3e7b802d96e02a6b38b2900db5f2ec5b2d3f2ff290eac81be7fcbc5a3514564d
font_02_sfnt_off00010d00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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