Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c046648d78f2977…

MALICIOUS

PDF

84.0 KB Created: 2021-09-04 10:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 300bb4f65cff2038af307000bf3b1b5e SHA-1: 98f175288ff9ffb353c55cf2365f50c8a0969e60 SHA-256: 8c046648d78f2977d079f006e471a00923e7386a03a14aa687f4066afb9834c7
116 Risk Score

Malware Insights

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

The PDF document impersonates a cloud file-sharing service, a common lure for phishing attacks. It contains numerous links to disposable hosting sites, many of which are compromised WordPress installations, suggesting an attempt to host malicious content or redirect users. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of it being used to deliver a second-stage payload or steal credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://landpas.pl/upload/file/raneguxafisidobategu.pdf In PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16087b6027030d---48695140886.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160efd2e45fba9---tikusir.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f60df8799a2---10737993715.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/b6c4s8rmio2088qf848maio35q/lugonufovejewagoxagukaxe.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/bamekigodaterafobi.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/83951998522.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/34475292557.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/39580161911.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160b30418bb547---fepewutoguluxubetukuzoz.pdfIn PDF document text
    • https://zold-kommando.hu/files/noxevisaxoz.pdfIn PDF document text
    • http://yurisolomko.com/userfiles/file/55765220239.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210611145237.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/desawidado.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/33088121248.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/30c7a174c4340792aa84bd0425508ac5/jimepegupeduwuliwuj.pdfIn PDF document text
    • http://simonide.org/userfiles/file/radulek.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/tesigujavor.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078550aa812e---38873066403.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/efb19be157b403a66a9570b3b8100d06/zuzuzevosotoxu.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/etkfeed358s9tlcname3jhrt42/karas.pdfIn PDF document text
    • https://bor-diing.com/upload/files/lorojuruzinojerijajupu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=pdf+editor+online+cut+and+pastePDF 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_off0000e3be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD5 10712 bytes
SHA-256: 6cb15af5170083b558343e0b8edd76ab3eddf66182553e72d2c7392f724c0073
font_02_sfnt_off0001148a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148A 17680 bytes
SHA-256: e5215d0abecf68278e88e97e1c8e955c73e94d80b0a0a37ce1d576e3ea622617

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