Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf4f1f5ff8105d74…

MALICIOUS

PDF

82.9 KB Created: 2021-09-08 11:31:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 3c6ad240b61ebcb4bf5744a0893a45a2 SHA-1: c4c47eaaecd2883d4d08c746bbb712e319d1d8e8 SHA-256: bf4f1f5ff8105d7416835274def8bca978728fb8ea6b91022dd99d907d60b7f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://irlanc.ru/uplcv?utm_term=verbos+regulares+en+ingles+espa%C3%B1ol+pdf PDF link annotation
    • http://kingcraftviet.com/uploads/ckfinder/files/51229138216.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d02eed6f7---zukudubutane.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/pebafaveluraru.pdfIn PDF document text
    • https://ijpdua.com/contents//files/29416860075.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/fugigulawamif.pdfIn PDF document text
    • http://escqatar.com/uploads/userfiles/file/file/sajizeba.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/bd580e7c5d3b60ffe429a4f2d9d89baa/bopowebutegibowone.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/a54087c2d20a26e26ff0eaf4db2cc591/35362020808.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/navanawudeze.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/jujipezexafagidu.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/90103916944.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/53898597147.pdfIn PDF document text
    • http://pvvc.cz/files/46220215666.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160866b148e3ff---81824075543.pdfIn PDF document text
    • https://digireg.nu/upload/dekilixi.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/1801287576.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/gatoz.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fd0e74545---fenudipozemukugirovisimif.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/156e6d1c518fc860f3d1bae81b3bdae5/744022763.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/85778575692.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/fukepozamosofudamatuweg.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/77840564686.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812153ad138---5035772834.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_off0000d77d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77D 19856 bytes
SHA-256: ceb1924c4715583fe2f3dc19b90e49b43eb3869781614a4f8c542c611b05271a
font_01_sfnt_off00010ae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE5 10992 bytes
SHA-256: 6d7a2ef31973b5eb035ec76c1b5f484702c9575639770d59a4da3aa6f9caae11
font_02_sfnt_off000123d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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