Malicious PDF — malware analysis report

Static analysis result for SHA-256 85e199240803defd…

MALICIOUS

PDF

84.7 KB Created: 2021-08-07 20:44:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f979f4d12ef86ce81a8e34c31687b79e SHA-1: f6f8cb15ff3da183b80a2b3a5bbcce66a809cb5b SHA-256: 85e199240803defd6d3d7dda6fbe53639ffe596830fdc14eca6d995cd52c11a1
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pernambucoimortal.com/imagens/files/zukuzepofewotobo.pdf In PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7c8bcc8e4---sadekeze.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/wamakovojopaf.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16102b90bd58cf---mopixupirijivitasig.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/razegironuxorowedobelim.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f863b6ee6a8---69467166160.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/51845431870.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/61414572902.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/74586143826.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/vugefe.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/dfd87eb1af32b31de1f4fc8f19d4e9f5/50094336532.pdfIn PDF document text
    • http://canoto.us/Images_upload/files/87708049674.pdfIn PDF document text
    • http://e-hematologica.com/users//file/lipupolijolibajoko.pdfIn PDF document text
    • http://velocimapper.com//webfiles/file/nalevojojiwoki.pdfIn PDF document text
    • http://ozona.pt/wysiwygfiles/file/53422587167.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609458c2ccc15---jaragabos.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c7784f53a---82197186307.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16073aab625e69---jogivopitivareliseziludef.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/zerisiferojuledopepu.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/vunemoxaboxa.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/5792334991.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/a6b9cd74c86c9fd3590630b0bacfccc1/98583133062.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=samsung+smart+care+vrt+plus+top+load+washer+manualPDF 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_off0000e119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE119 11196 bytes
SHA-256: c6f813fcbad5fb736820d48ea0dba36dc91170ea0828fa75d58c27a94dfbc6e1
font_01_sfnt_off0000faf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF3 18068 bytes
SHA-256: b01fedc819d93a597823faf9a08368ade1f73e4c7e1c8017b422b5cc3ec5a705
font_02_sfnt_off00012a6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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