Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed30418aa6a0b3cd…

MALICIOUS

PDF

85.6 KB Created: 2021-09-06 07:38:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8453a0311c494623e30aa81c327c9924 SHA-1: 725c402d9d14cfe663d670cd5d9749110ebdf6ef SHA-256: ed30418aa6a0b3cdcd106617cb9673e5539c86aef6ab0e29834f02b4da7772fd
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier strongly indicated maliciousness, and the structure suggests a link farm designed to redirect users to external, potentially harmful content. No scripts were extracted, but the presence of multiple external links is a strong indicator of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://queure.ru/uplcv?utm_term=citation+machine+apa+manual
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/25e4e206091c65c785a6cd506f7dd0b8/pofasolulenevomikoxi.pdf
    • https://akrmedia.no/ckfinder/userfiles/files/63599699935.pdf
    • https://alcoquimicos.com/ckfinder/userfiles/files/wunuvu.pdf
    • http://caythuocdangian.net/images/files/28924068864.pdf
    • http://bjsprt.com/uploadfile/file///2021070801030159.pdf
    • https://myarchitect.es/ckfinder/userfiles/files/58221941369.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/55626dc76d215d4934053a1881219420/vavakazuje.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e6b219ca598---43057904248.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/ac52bb0f33fea90f5cbad10d592d9161/48908900598.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16081e5a16ac27---rexokaxibilik.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e6a2bf2585a---modawivof.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879fed9dd84---jomupuz.pdf
    • http://ssujaxchapter.com/clients/83257/File/nukepu.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca9426b104---takazatimunejuwopu.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/d2afa9b857e3043bf3aecfeae0a3b94e/pifuvibomezaxexefu.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/db7613d103fea54a2509b36d0dc27cfa/66582644127.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/7vqked75ags6gd269lj9sipch1/31723407163.pdf
    • http://abwfinlay.com/uploads/files/dakiwapemiz.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160916f3fd5f8e---povitobixevimanin.pdf
    • http://marjoleintje.nl/include/userfiles/kekikiruzobitapol.pdf
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/mqg8sli0dsc6pb56h72ika55l1/45218423852.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e88c.bin
8a5469321ff3d4db1c0b0fb8f8d09aa8d818b9700d4010b7e45ecc2c0842b7a6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE88C 18876 bytes
font_01_sfnt_off00011989.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11989 16792 bytes
font_02_sfnt_off000131a0.bin
0e5bcc75c3cfd8a320a124e9375aaba8b412bbdd09355abd349d2992efc4a746
pdf-font-stream PDF embedded font (sfnt) at offset 0x131A0 10500 bytes