Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7aa4b44ac7ac4ad…

MALICIOUS

PDF

73.7 KB Created: 2021-05-28 19:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1321393af911eb27b7702e142a08d6e SHA-1: 281414ed909000a1ad23fddb584556bbd6a58b3b SHA-256: e7aa4b44ac7ac4adb770e2d967315cdcdd3ae0b52e49a5e94bd33ca6139a42f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing malware or conducting phishing. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://inwebjor.ru/uplcv?utm_term=copa+del+rey+balonmano+2021+entradas
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fd8614ec8---96770162243.pdf
    • https://roweryelectra.eu/app/webroot/uploads/file/1620359761562.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/9011118ae8d3ec46284eb4d832081a07/11111632236.pdf
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/85881dbfd2322bc5091ded8f888cc0c8/juwigesebo.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072429a955fb---63359571194.pdf
    • http://matstravel.ru/userfiles/file/13923955039.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1a5967f54---kitosamet.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608b28a798752---bojabutewubumeromatarag.pdf
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/3t6gjnln8dkdvju6cq9efp71s2/lemiz.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607fda30b8fa7---xabomonuniralumujefal.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea76864981---67955315871.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/02uur198gl32fpgcummi6il087/75016939519.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8b38b9de7---vulutufoxasiz.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cd9340f2f---58769754492.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d319.bin
19fe6d3511270ee3ff4fbce704f5f4a9fb9182a4344e37e40a38d55828b07e20		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD319 3312 bytes
font_01_sfnt_off0000defa.bin
3990af7b6621f51648fa1d7dee387c29911e4eeae028bdf3b5fd3e5cbf6b68df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFA 5576 bytes
font_02_sfnt_off0000f1d6.bin
74c44202e9f1e7e69f4df7ded8b328faf63abd98cce886219e2b7eabd4e088a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D6 11824 bytes

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