Malicious PDF — malware analysis report

Static analysis result for SHA-256 059c43ae2b4575d0…

MALICIOUS

PDF

88.6 KB Created: 2021-08-02 21:00:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3922c0a4a8683b77257de3c1a4221809 SHA-1: df9b69ba1172c8d77b18c0a5d9dd0a2997e2b881 SHA-256: 059c43ae2b4575d08bbd9f03f0ed7f267866aec6def8658af3c085ddd76caae0
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm intended to redirect users to malicious content. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs points towards an attempt to distribute malware or conduct phishing. No scripts were extracted, but the overall structure and URL distribution are indicative of a malicious PDF designed for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 5

  • 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://infrive.ru/uplcv?utm_term=how+to+use+eliminator+lawn+weed+killer+ready+to+spray PDF link annotation
    • http://amandatravel.com/userfiles/file/67458799096.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/funewewisewug.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ba00d76dc---75324339880.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/46942001195.pdfIn PDF document text
    • http://pronobile.de/catalog/file/nitugigajojesazip.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/e6374b902dbe0b00ede2d73eac0ae521/50064774488.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/61202242389.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610592f6ac44e---rusovejawevuregat.pdfIn PDF document text
    • http://siembra.me/uploads/files/88936556771.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/bd18e275e505f1cccaa21c1d789f2262/57808843374.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077e9e5c85dc---pulezadanenikozev.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607118c3d4337---55071174941.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0686e82e9a---bejobuvan.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/5a0d1a5260b4b7855f3ce3adc6c5ff1e/82492506803.pdfIn PDF document text
    • http://kangs78.com/clients/66216/File/28144386852.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/74241515592.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/41156820067.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/46032536203.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/0dbbf6ed97fb201955a53bd3387df6e3/gofakezitakabafefofijiwo.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/66905845489.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/d52835265d78e0b04260b4d699beac14/15417741278.pdfIn PDF document text
    • http://jentretiens.ch/uploadimage/50542390676.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/47803357290.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609884cdd5888---menewova.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_off0000f325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF325 10936 bytes
SHA-256: 86be249565708bee6450824af3ed0bb93ccfbf1d10eb97da4638d451bd0b211b
font_01_sfnt_off00010c7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7F 17760 bytes
SHA-256: 3cf4c59cb3b26031a330f9d2cf6ebb2934723cfd5df28edf3c2fc5d9053666d4
font_02_sfnt_off00013ae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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