Malicious PDF — malware analysis report

Static analysis result for SHA-256 3afc2d8d08c1c66c…

MALICIOUS

PDF

80.2 KB Created: 2021-09-13 10:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0d35f867079a1c6f96490f06cac0c679 SHA-1: fd9118033b9e38b561853f1ff69bbb5bb2d13346 SHA-256: 3afc2d8d08c1c66cdd9a03cf85f3017d449f773f0f88cd319c7c0ea69f86c86d
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, indicating an attempt to execute malicious code upon opening. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a redirection mechanism for phishing or malware delivery. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613c55eacf1cb---sejoweletowan.pdf In PDF document text
    • https://ev-owners.jp/userfiles/files/zifetosefojirewimu.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/70897440322.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/lulotiw.pdfIn PDF document text
    • http://all-premium.com/user_file/files/53773525476.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/xefivuwezuzodaditiji.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/72177715056.pdfIn PDF document text
    • https://drlanda.hu/user/file/89364236366.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/72843727133.pdfIn PDF document text
    • https://self-storage.sg/images/uploadedimages/file/6748649771.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/ta8kduegetufkl13cig491j401/81774525953.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109110547085365.pdfIn PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/vawikaxatesuxa.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/27943379108.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/40217730472.pdfIn PDF document text
    • http://hocomesun.com/upload/kenunoj.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/c3bbd5bbfd8f7a5b0e1672a0b3d1fb6b/22624472263.pdfIn PDF document text
    • http://kes.org/upload/editor/files/zaxurewo.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161360019a0427---zejidiragufonikosunil.pdfIn PDF document text
    • https://rajnnuhiddje.se/userfiles/file/27015931833.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/6241663d031a7643735072c2335edf4b/tikufakutevat.pdfIn PDF document text
    • https://chungangroup.com/uploads/files/202109030614046692.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/ziguwulilujinirifu.pdfIn PDF document text
    • http://thietbiytedaibao.com/media/files/jerewu.pdfIn PDF document text
    • http://it-hair.com/userfiles/bajuvofokogumuxir.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131ba6900d0b---xixipaletagetax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=tragedy+and+its+elementsPDF 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_off0000d78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78A 10548 bytes
SHA-256: fdbb21974026dff98965f90527db3697b4f402213abc7be11691c220eef8d3a5
font_01_sfnt_off0000ef54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF54 17336 bytes
SHA-256: b1b63939a65bd192014f46c5f5e75ed0eee71d976e14c884a9d9190b6815a467
font_02_sfnt_off00011b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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