Malicious PDF — malware analysis report

Static analysis result for SHA-256 56b398baf897499c…

MALICIOUS

PDF

85.4 KB Created: 2021-10-05 09:34:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 469b8333cfe8d82f6bea4cace8b02a44 SHA-1: 217a4fe48e184d961828becb2fae489440f0b453 SHA-256: 56b398baf897499cf1710cf8403dcffccd52a1f377f06f57d9676733690e0b42
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the presence of compromised CMS upload links further supports a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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 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://catamma.ru/uplcv?utm_term=operational+amplifier+frequency+response PDF link annotation
    • http://abpjseah.news-read.com/upload/files/27028082018.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/tewizakajixif.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/dikaresijuwubajapisufo.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/wezatavobu.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ee6d03125---33819228568.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614b98640b924---47354886198.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/20954419202.pdfIn PDF document text
    • http://sarkanyhajo.hu/files/file/vinopinure.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614b37183bead---xijegadi.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/47668473431.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/xuponasakebane.pdfIn PDF document text
    • https://alariel.be/userfiles/file/51885287856.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613738d94c0ea---matugufukutuzef.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/39582264622.pdfIn PDF document text
    • http://s4l.vn/storage/ckfinder/files/siponazogafu.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/96211167561.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/4935934875.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/u41r46gq8em5vggnlu3egk3gp5/52901706045.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/kefabu.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/23605928653.pdfIn PDF document text
    • https://sabresources.com/FCKuploads/file/regerakokogebe.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/parekojidumigi.pdfIn PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/45177324883.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/22079119880.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_off0000e567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE567 18700 bytes
SHA-256: f46e294363f5024e73320e282105e6ce60ec4a062774a627a7e0dd788669c670
font_01_sfnt_off000115da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DA 11024 bytes
SHA-256: 726894abd8526e01cb54675c1f7e70b0a4ceac5c295d0cb9bed36909d846b28e
font_02_sfnt_off00012f8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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