Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c2fcf5efaa6160d…

MALICIOUS

PDF

90.6 KB Created: 2021-09-07 06:19:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b557db0d96ce3c0a65cdeccefbbf0665 SHA-1: 7609172ad93d0c4af4c43e08a16fc203c627f08f SHA-256: 2c2fcf5efaa6160d11427dfe6936e7a8f5721ec012c7fffb45cb64e8165faf1f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO manipulation. No scripts were extracted, but the structure suggests the document's primary purpose is to redirect users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/ft7hjtef4jqlopa3j42sqls0i0/wexer.pdf In PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/16105ad60e1e14---fatedidunokeva.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com//ckfinder/userfiles/files/10302226798.pdfIn PDF document text
    • http://hacsbathtarntaran.org/~/userfiles/file/vajapi.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc709704f0---matonil.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/29280165319.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/2549908315.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0407659395---xedenuruguzeb.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/11586339637.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/rekiwebeja.pdfIn PDF document text
    • https://123natura.com/stockages/files/81822174405.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/paxatadenivowoxoweluvub.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b082cee865d---29018233216.pdfIn PDF document text
    • https://x-software.cz/data/file/wujodatufotavoxi.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/gofaxidoxexexipiloliwe.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/2971983985.pdfIn PDF document text
    • https://smallislandcurry.com/wp-content/plugins/super-forms/uploads/php/files/b51e0772c347ec690eda322e150ce522/93052098925.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/80493320759.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/wazuxemobu.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210731_5B051F8F34FFAA3B.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/24447553559.pdfIn PDF document text
    • http://mcelvain2020reunion.com/clients/b/b5/b5167212b805812c9439186484f80f5e/File/xejitaravu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=project+on+monopoly+market+for+class+12+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_off0000fa18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA18 11196 bytes
SHA-256: 3de3d49940008ff3048400b2fc486058b1027c0c20901296a6825d6cadc536c6
font_01_sfnt_off00011479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11479 18732 bytes
SHA-256: 58b46068aed06fb5dd5402a3dd71961c5efb8ede3031b76d0f8485b348a70cca
font_02_sfnt_off00014519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14519 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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