Malicious PDF — malware analysis report

Static analysis result for SHA-256 2334b7d7e6ba431a…

MALICIOUS

PDF

108.9 KB Created: 2021-09-04 21:08:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 32209a6c56c522cf05bf6e351d4694d8 SHA-1: 3c2e7695702f7159c17e46cae22099c5ed156567 SHA-256: 2334b7d7e6ba431a9eafd0af110c12b1bbd0948b880f8e054951c16b3a7da5b7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs and link farms indicates an effort to redirect users to malicious content. No scripts were extracted, but the overall structure points to a spearphishing attachment attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://oniceh.ru/uplcv?utm_term=bilbao+city+map+pdf PDF link annotation
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/3416qa1u0435j1qhmvst7rn4v7/6326429475.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/furukigadazatafurig.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/5860d41d3bbbb992872f2cbf7d617790/kelotoxozuxawaxizupudu.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/2uuallh706kg2bc2t56dj0tco0/xizumobirujimet.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf613eebdf---nikovagepas.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1b37823e8---nuxixepidojovixegexemif.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/f4ef6babafa57c31be07065187aa61a3/luleba.pdfIn PDF document text
    • http://taskentcompany.com/userfiles/file/97190421838.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad111d8d56f---kibuvebisegegudodumodanaj.pdfIn PDF document text
    • https://ebdaatcoop.com/userfiles/files/wutijudafaga.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/xuzegijikuvuwudorozuned.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/27761115149.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7f6a8e659---18269970557.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d2611ca22a---zepigole.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9cc03530370268a68a73bbe36f2b4af5/mofaxenawunotuxazibi.pdfIn PDF document text
    • http://www.climatisur.com/ckfinder/userfiles/files/turaxirepex.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/ninafabofepisabikazizefuw.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/gajotuwerumurezijasatu.pdfIn PDF document text
    • http://prestopc.it/upload/file/wamuras.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/susujekav.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/f02c9de174b924fe7b558d77392faf40/31069434076.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b228d47bb---96504901244.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1611fc0b763bac---futodagemagakenodisagab.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/zubilapuzopem.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/makoduwatojujagepo.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_off00014374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14374 19024 bytes
SHA-256: 63ab3786f69e50f92a0b40fe7dbb221ffd336c9e71d729124678fd5c8996ab21
font_01_sfnt_off00017527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17527 10584 bytes
SHA-256: 88a5b91c0ff2b03e704355d9b9687541ce904269ac7f308e3320d370c17fed3f
font_02_sfnt_off00018d29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1