Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f71ddc8cf342fd9…

MALICIOUS

PDF

90.6 KB Created: 2021-07-06 16:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 359bdfcc1cea2819c38870b283f39000 SHA-1: 0a46a367c0acedd9b59b969b51dd2faceb97daf5 SHA-256: 7f71ddc8cf342fd915aa2506ad1d14ddfe694a5aec6b5b6bea593be0cdab3dc8
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of links pointing to compromised WordPress sites and other disposable domains, indicating a link farm or SEO manipulation scheme. The ML classifier strongly flagged this PDF as malicious, and the heuristics indicate it's designed to leverage external resources. No scripts were extracted, but the structure suggests it's intended to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 5

  • 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://onnetsolution.in/userfiles/file/xudawebemeso.pdf In PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/d8d5907af6e0811922395960261945ae/nawamofikixaxin.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160885786177d1---juwugevurakofotixesazuve.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9347d7ab6---mefawu.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d11dcf13e---80700896664.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/9f8b76c862cacd4b5876d1b9b5c2c87e/28491609433.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/71aee44f74e6b7fdc211236cdad09061/vegugisagazalazi.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/42893183616.pdfIn PDF document text
    • http://guinyardfamilyreunion.com/clients/62985/File/3542489386.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/j94hq1116k5gkl0q5eqavcela1/pukofukinez.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/99134695321.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/69724499404.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608956ce9c4c1---67039904163.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/29535b60f680a78bf0a361ada048158f/pudoxejavubepux.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/fawujupepemakis.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/tuguluzuzusike.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/80561635682.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c83c86c144---bufaxolufumegugo.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/lufovus.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af86837e73f---wibatorikulugeler.pdfIn PDF document text
    • http://inspirationforexcellence.com/clients/66491/File/pugozavosisis.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec11881985---32067526304.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160945c0b116f3---vuladedolitozavevugodoko.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/vixeninanelakomif.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd01d18a1d7---feboberopifo.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/0e8b293beb4afb240fb4e4bc1fb07c7a/lufinorutogumijo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=small+abc+alphabet+in+four+linesPDF 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_off0000fced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCED 17524 bytes
SHA-256: f79585f3c15e4df02b4e71ddfbca713b0bc15aa63df9297318c0f5edca2fda9d
font_01_sfnt_off00012a0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14222 11060 bytes
SHA-256: 35069918a94aa883bf9e2be28f24f7ea5e6d73fe0e9216e8f5dab1c4ddc3654a