Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ade3585cb1a6390…

MALICIOUS

PDF

73.0 KB Created: 2021-09-08 19:25:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 35b2f6c725e7b2c53408a11e8bd87019 SHA-1: df276e1db57073d40e2492de56f6603c4294e9dd SHA-256: 0ade3585cb1a639055b6a11eb95d1659578ac3ec538993e7a3046c470ab25cbc
156 Risk Score

Malware Insights

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

The PDF contains numerous links to various websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://magiccat.pro/ckfinder/userfiles/files/rowukinadum.pdf In PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/161338c99196c3---98827952961.pdfIn PDF document text
    • https://pasifikendustriyel.com/userfiles/file/lafanuzavaronezikositidak.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/62019623687.pdfIn PDF document text
    • http://kingsfci.com/userfiles/file/95191626917.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161337a7ddf195---21089767935.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/pasabaxi.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/vinobi.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/wuvopevivebaximunopaxaja.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/kexawizuxolika.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/241822967.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/buwesegoredisaxi.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/21401791155.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/54223984300.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e08d45fec---71052506236.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/takazejopalilaga.pdfIn PDF document text
    • https://betamachinery.sa/other_files/File/jakafajafipagal.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b211ab8dc---nawememinegula.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/duwozafikafebotalof.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/padefedeje.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/bdf3ef2ae087faa687eb64f7c6712182/vazej.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161314cc0dbec9---rivisa.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210904_205244.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/tegetifikovotagigil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=diferencia+entre+urgente+e+importante+pdfPDF link annotation
    • 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_off0000bb2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD343 10848 bytes
SHA-256: be86667567a921448cdffebf3ee4b8ca94e4cc661058e722bd0000d762dc0ce5
font_02_sfnt_off0000ec17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC17 16640 bytes
SHA-256: ee16ce196983f403a727b518b89fae7bd9e5d853d97497742a95b10f01f928f7