Malicious PDF — malware analysis report

Static analysis result for SHA-256 9178f17916d9fb3e…

MALICIOUS

PDF

80.0 KB Created: 2021-09-24 04:16:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 933a4766c1849bda53e399737798958d SHA-1: d8a80057eac0cbba91bd7bf094f8c44d6976f174 SHA-256: 9178f17916d9fb3e7f3e4069634fc2ce80e6dc1c3bcebe9bff416de410f138f5
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to other PDF files hosted on various domains. Heuristics indicate this is a link farm, potentially for SEO manipulation or to distribute further payloads. The ML classifier strongly flagged this PDF as malicious, supporting the suspicious nature of the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://radissonhoteltraining.com/userfiles/file/majebovexu.pdf In PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210918085222.pdfIn PDF document text
    • https://pcetravel.com/files/file/vezagawafalijoreg.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/rogosanapo.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/17475625800.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/14483531070.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/63727666639.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/77007409361.pdfIn PDF document text
    • https://vozilasavozacem.rs/files/80728027514.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/zimerex.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/81276347764.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/rekavupofoged.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/betuxazeninikelozewife.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/gosewekowirij.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/jifexorovuz.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/milunigeduba.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/63807812621.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/751e476b6bfd35ded2fdd937bbf65c94/75189133354.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161494066a2817---5789610991.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614440433184f---48374801116.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=white+pages+androidPDF 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_off0000d2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AB 18556 bytes
SHA-256: 0f605cebc4643356316fae9233eaf1c93371407dace254daaa73642c4b1bd055
font_01_sfnt_off00010272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10272 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A89 10616 bytes
SHA-256: 99a5ec3d26e6527dae1ff8f4c87d7513031ee37d308fb1a9da5f0f2dc250056e

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