Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc20a0e2dbe16a16…

MALICIOUS

PDF

86.6 KB Created: 2021-08-21 04:02:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: af590fd4caad267574fdba812a049421 SHA-1: ca3057fc0a6e81e61928c29dd565e2629e2b0d1a SHA-256: dc20a0e2dbe16a16e771e9a43c96ac2679cf483321b9723d019db5a11be49774
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites and other disposable hosting, indicating a likely phishing or SEO manipulation scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the nature of the link farm suggests it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://autoscuolauniversale.it/userfiles/files/pazime.pdf In PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/59f95a1b958ed2c1cb92a51778d5bb75/65357281269.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/2032f06fb667e1a90c9d485267c7beee/petatibur.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/98708523500.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/poberamabivul.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/86386124657.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160712250a2a96---75977015527.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/kibed.pdfIn PDF document text
    • http://gazduire-domeniu.com/UserFiles/file/40722462069.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160862bdab63a5---sipatapev.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/leruxulelumajakelazaf.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc6a289ac4---molawonafejumenupuz.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078d9901caf0---figorenududetufetumiro.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/28589118411.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/pefijapixajituzitewixaw.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609031bc787e6---bakixugebepuxizoli.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/ba3be14f8138d1761d3908221d4187ee/87421418021.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082a62b39eb8---90615752258.pdfIn PDF document text
    • http://hopkinshigh1961.com/clients/878968/File/fibexurepoxuraza.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607785848f267---33108881630.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/nevuja.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/zedivizaxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=borehole+drilling+pdfPDF 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_off0000f00d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00D 17272 bytes
SHA-256: 433178916603e4e1e55785b19dbedb62d59fb92e73e613b4f631ab95eecdd8af
font_01_sfnt_off00011cbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D3 10404 bytes
SHA-256: b2be1db24f2e86f53553fd77fa28e6e96b018c72f04b6efd2706736c9d56f619

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