Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbfb7eb4731dc838…

MALICIOUS

PDF

81.1 KB Created: 2021-09-04 00:12:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 11f9fe5d5696abb10c936af0c67c9732 SHA-1: 3a98f28b44fb889829700c46762f46db4657a70a SHA-256: bbfb7eb4731dc83867d50c78f7e89138ec1cb32bcc54ae318c15ec0804803fb2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites, likely intended to lure users into downloading further malware or submitting sensitive information. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for SEO-based link distribution, further supporting its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://hasyo.net/files/file/561973170.pdf In PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131145733735---kipekitomosop.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/28446028911.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16081a36b3da2e---44517443822.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acbd13a206f---30505246637.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/58f29b5daec5fa11c9fd1f9b57faf9b3/13726252925.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/5orb1rktmv9rln16tiqklrtdeu/winawawuti.pdfIn PDF document text
    • http://euro-ex.com/images/blog//file/48530378098.pdfIn PDF document text
    • http://dr-temt.ru/images/file/foditamiji.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fdfcd293c---75037693075.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/forebawudalenobosojupig.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/36f8e2d46ad8d3fbd57dd849e17197f5/75426069704.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/nikoremiguk.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/772e9252bc6f6192be1a61f58d73ae7a/99298793590.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/56544879979.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/8f6b2cc3af10da3c693c66ceaab1665e/14529818577.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/ef813a70bae8dfd2a893ae38aa4950da/redugomevomenegitab.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/wisekipunafexofa.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/bubukowipategeluk.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608be28109492---38739268803.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bedc4b5062f---jubalazutaduwolovo.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/5k4o4f67g7ejs7peuq76kjr9mp/fopag.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/bepevopabitunup.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16082c5f803862---mepewiradivasamiko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=relations+discrete+mathematics+tutorials+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_off0000d58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA4 11028 bytes
SHA-256: 6dc0e70ce9647c86c07544b43603a45e686b163658bdebe19f4d6b132bd6e4a2
font_02_sfnt_off00010713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10713 18116 bytes
SHA-256: 04cec662f111a8e252ba7a58e674efc7e8af1af24215570922a82f9605d91f44

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