Malicious PDF — malware analysis report

Static analysis result for SHA-256 633332938cf9f84f…

MALICIOUS

PDF

80.3 KB Created: 2021-09-04 14:36:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4dad27aeb93ebe0d87baa8e459483880 SHA-1: bc9637fe1de2293004a0f6eddb5a24be714c70ea SHA-256: 633332938cf9f84f3d80210889cfe25c526b22092f651d7e8efd0236b25a2938
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm heuristics pointing to compromised WordPress uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The presence of embedded URLs further supports this, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://coretry.ru/uplcv?utm_term=concurso+inss+2019+pdf PDF link annotation
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609454ccbd360---53207861645.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/kekukisomijugif.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/60323707756.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///rimosude.pdfIn PDF document text
    • https://songhong.info/userfiles/file/penulafezedupoxodixo.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/20856473636.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/eb78913981160c366d09ed36be1d48b0/jezuxaponomitezopab.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160809f4617d6f---27008524512.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ae858aee6---31220816675.pdfIn PDF document text
    • https://ww150003.linebot.net/upfile/files/20210904063708.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/h5375jp8qrb672aoqh68i2tsdn/28334911362.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/ad4d6d4cff21c488fb575375e8f1c9aa/wivodejeg.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/eec23197fdcfe7f2be1967d4395ead1d/67371470659.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/a890617c33e4f8638655a21886668a5d/xaxubogizusabefuzofas.pdfIn PDF document text
    • https://birudongker.com/contents//files/zijojedujogosiroz.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/42490553832.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798242739b5---82450695056.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210521150710160.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/bovufubobigofatukeriseb.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e62d4b0b63---taxofisenobitiver.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/bumojudusoguvan.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a06f8c816b---83753405492.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/30573e89bf340f8d044dbae3f5a6ab98/sidirir.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/77171983dd16ac8b5da4756b82e219d1/30428358154.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_off0000d08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD08D 18816 bytes
SHA-256: 74f196e34fa87711a4da40a0d65d1a7d3df4e4db798a8f985a7c06468ce26363
font_01_sfnt_off00010130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10130 10768 bytes
SHA-256: 9102d3cba574f29e311b81a3b8d832ea62e47b349b04bfcbce569dcf3950a4fd
font_02_sfnt_off00011a24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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