Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb6557609b11fa42…

MALICIOUS

PDF

74.5 KB Created: 2021-09-01 06:43:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 21317479c79ce892036f169febbc3a9c SHA-1: aeea3c3ca4b7be88cf75ca12e53020c2e1b59bd2 SHA-256: fb6557609b11fa42a66acbfae9a954a6a8f5ea70d8e5730e311d58c73c26a3ee
104 Risk Score

Malware Insights

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

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting. The ML classifier strongly indicates maliciousness. The sample's primary function appears to be redirecting users to potentially malicious websites through a link farm, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://ketchas.ru/uplcv?utm_term=love+you+my+angel+quotes PDF link annotation
    • https://smartstone.ca/userfiles/files/vulevuxive.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/vuketibexod.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/9ph2vg5tjkpd3fi0utk8scfdb6/87015337402.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/nixisazodonedapa.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/sixukugagezazuwuxufilix.pdfIn PDF document text
    • http://neenah1976.com/clients/17995/File/11768483572.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/61262704502.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/11636720310.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/76046050747.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/49929786030.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/lurolovo.pdfIn PDF document text
    • http://tasarimak.net/ckfinder/userfiles/files/gurirudobigidulap.pdfIn PDF document text
    • https://maturana.cl/upload/file/diwokizupil.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/wijasinomusujifiravisaj.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/77547776780.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad5e901dab---lotekirijubaxilarifipinut.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/46172920143.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/c1a273165bd0d02b8af2e0d380daae06/nivofevutew.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/rarilikinididasanafag.pdfIn PDF document text
    • http://arslanemlak.come/file/10886658977.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/zazoxizifat.pdfIn PDF document text
    • https://soechi.com/userfiles/file/35897698995.pdfIn PDF document text
    • http://wonikqnc.com/upload/editor/file/1623211645.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia//files/suxowujepexexanig.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/goleraxapizun.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985513aa110---40682424776.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_off0000c311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC311 10644 bytes
SHA-256: f9b86e2777e2b91f83a1b5f1ed1a91bde42079949201103f41d8a4eb08e13df0
font_01_sfnt_off0000db33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF345 15796 bytes
SHA-256: 4ce9aa71badab329e20986451d950c2d248ceb25b76c75daac989935617acd49

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