Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bd08ad850d95966…

MALICIOUS

PDF

79.9 KB Created: 2021-07-31 09:06:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bf40486cae8f220aba56fc1ae6dfa723 SHA-1: 516d4bf67546f5ff35d84091cec07e83559d832d SHA-256: 0bd08ad850d95966bf94e82bf30cd75a35b435ab82a21e51199862f90eed7fc3
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, a common tactic for distributing malware or phishing content. The ML classifier strongly indicates maliciousness, and the presence of numerous external URIs suggests an attempt to redirect the user to malicious sites. No scripts were extracted, but the overall structure and heuristic firings point to a malicious document designed to exploit user interaction via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://drafthe.ru/uplcv?utm_term=resistencia+de+materiales+beer+pdf+descargar PDF link annotation
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/5c0d48e57d9bb71df357e1b65a0f0931/95025594033.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c24bbb1cd23---71936715224.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e20a89df6---25291650522.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca482d15a9b---pavareju.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/61c2af98bc9bb1a41bf8a578f760be58/62899545321.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/vezeporo.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/49544048425.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/vewixikuwisukivejodu.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6393877b3---41916103975.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608bab908508e---fizimaxapaviriravabef.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/mogukatiriwifimogitabepe.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/2ad95f20e020220e7380fbe147c8374c/tevuba.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609768fcbab94---33640664436.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/32008443576.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/9c69391a64b60b098b4f978cc89ab9be/mobimagukotepuwowabarew.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/bakefutebemevekewogijeg.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/biwitisawolalupekaguwi.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/gipenuwekubebuduju.pdfIn PDF document text
    • http://techniq.ae/admin/uploadfiles/file/xofatemoxadelifegovebaba.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/tevadoge.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/e67dd6053e1419f9c1c26e20199940d3/91859781914.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac64d999dec---54427436553.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/jelizekujikematezuwidow.pdfIn PDF document text
    • http://bienbao.net/uploads/files/xujiboxerodizi.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_off0000d0f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F2 17856 bytes
SHA-256: 6a221f92cf0230673d9f6cad565234a84cf40da63734060b831fef04579ecb15
font_01_sfnt_off0000fe9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9B 11028 bytes
SHA-256: 6ea8f2f07c01e7ab5772b2c701cde832db962d63681cbdbad186bf0132cb8755
font_02_sfnt_off000117c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1