Malicious PDF — malware analysis report

Static analysis result for SHA-256 466ae3a20241c963…

MALICIOUS

PDF

69.8 KB Created: 2021-09-28 11:57:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c2b0d088465ab3a50be15965f154690b SHA-1: d76aeda42826f1079112efd71c0ee80baf66285f SHA-256: 466ae3a20241c963853a8b3d6915f1ef09eaf94468c7e0730ef2d6ce6d753776
96 Risk Score

Malware Insights

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

The PDF contains a link farm, with numerous URLs pointing to potentially compromised or disposable domains. The ML classifier strongly indicated maliciousness, and the presence of multiple links to external sites suggests an attempt to redirect users. No scripts were extracted, and the document body was unreadable, limiting further analysis of intent beyond link distribution.

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 http://full814.com/upload/files/17299096759.pdf In PDF document text
    • http://fujavietnam.com/images/Download/rakaduliwilubadal.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d2e9658966---28993235996.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/kasevefukenebo.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/5007248656.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/75614183745.pdfIn PDF document text
    • http://citlak.de/admin/UserFiles/file/runutupok.pdfIn PDF document text
    • http://domplus.su/userfiles/files/gixowikawuvupelotod.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/filepufep.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/60278015126.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/ropividetafi.pdfIn PDF document text
    • http://hairfibers24.com/upload/file/nadivukerov.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/menodilunifabunewovafor.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/21607974790.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/77535471783.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/tatunemaxe.pdfIn PDF document text
    • https://mchs.kz/userfiles/File/13439642390.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408b215e4a4---60615733293.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/94479915228.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/ledotagasotugeteni.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/e6a76ef60893f9dd2a060eaacb9d8c08/bazokirumovowabiwazurini.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/sorefejukoz.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/18654140784.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/sajuvoruvanorovelosejat.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/pujizuzovexozejugiri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=eliminate+ads+on+android+phonePDF 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_off0000b3a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A6 10640 bytes
SHA-256: d6385646ed684afe4b93200d96530793abeb004d3a090acdb5359399544c07a5
font_01_sfnt_off0000cbb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB1 14332 bytes
SHA-256: 697cbc713346b4d39d508afbe42ad1e46e17b1ec84ab3d60b5d811ffeeb964c1
font_02_sfnt_off0000ef98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1