Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a8083bc24e5e19e…

MALICIOUS

PDF

72.2 KB Created: 2021-09-03 07:04:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 196fdad6ee1f07a1e9f1f2fcbcc7025d SHA-1: 97640db15879742015397ed8f1cfeb0a09c284cf SHA-256: 6a8083bc24e5e19e89b6d603d238a03ebf3a0be1e938fb14c678ccb35162170b
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier strongly indicated maliciousness, and the structure suggests an attempt to manipulate search engine results or redirect users to malicious content. No scripts were extracted, but the presence of numerous external links is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://indirimlipin.com/calisma2/files/uploads/31551371431.pdf In PDF document text
    • https://hotelexpert.ro/uploads/files/43451678500.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a49d19049---ripogiv.pdfIn PDF document text
    • https://viscom.bg/uploads/wysiwyg/files/pivaserugus.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/27694064289.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/1c3c34e4295addb23cc2ee8786cb31e4/fubujeritaxusen.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/xolixirixedep.pdfIn PDF document text
    • https://okna-kursk.ru/page_edit/_samples/userfiles/files/89298249748.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/60e00f22fa98bc73d82a76ad11a65d98/xuwafe.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b31d12c9320---mizegagowefizuzoper.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ba29ce0fa2b---fekoli.pdfIn PDF document text
    • https://cesiedizioni.com/userfiles/file/rixagozadirukaloturafe.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/6008445693.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609421d8bafab---15022513212.pdfIn PDF document text
    • https://soechi.net/userfiles/file/21330088897.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/88055267879.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa6110175f---95918858629.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608cdfa0883b8---42066293283.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/jobuzitaxap.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/4be9e705a8296318e63392fb2305f547/13045221676.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/81350284996.pdfIn PDF document text
    • https://digireg.lu/upload/sejexexukuz.pdfIn PDF document text
    • http://12shio5.com/contents//files/gujovo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=java+extract+pdf+table+dataPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/13850858304.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_off0000b9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9FF 16052 bytes
SHA-256: 29f04cff14817b4c2400e576fff533e34dae69e6d86549450045bf7b75c07ba3
font_01_sfnt_off0000e341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE341 10428 bytes
SHA-256: 5809fec4e6ec098dd9db34cb6aff846e4b5dbb7cd7b815394704b4ac10b0d6c5
font_02_sfnt_off0000fad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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