Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c7e0ba7caf3147a…

MALICIOUS

PDF

80.0 KB Created: 2021-09-03 04:12:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 82f64962f41e9245859fb2def721a920 SHA-1: d030ffbc365c013c98d016ee6f59b0785e18fff8 SHA-256: 3c7e0ba7caf3147aa39c78e7f2ea294dd747055129a25aa8700898ec25309fd0
96 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised WordPress sites, designed to trick users into downloading a malicious PDF by impersonating a legitimate reader or update. The ML classifier strongly indicated maliciousness, and the presence of numerous external URIs on disposable hosting supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://laborke.ru/uplcv?utm_term=pdf+reader+viewer+2019+pro+apk PDF link annotation
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1ada2547c---52979683886.pdfIn PDF document text
    • https://cebrigantina.com/025-CEB/images-editor/file/34255542880.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b92cafb5224---86655860233.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/63736333903.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/sakekamibawodakid.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/wirenulipunopilabate.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/26848091876.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/5f4dc52ugkdf4ebpenv1qormou/fadasuforotabemon.pdfIn PDF document text
    • http://sammyuriasproperties.com/userfiles/files/23761681523.pdfIn PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/16425183567.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/jesavi.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/75539509479.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ak9vl8uk9icq0f5vkavhrg158s/94433093524.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bc93810e1a1---linisufekuwuxokusekamoj.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160abe18c2866c---sitikolarag.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210903_075224.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/lajot.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611d09ea66dd8---jupinarowuf.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/di9dpg364mpdpqqbso5snh1u4g/vuliwulaxu.pdfIn PDF document text
    • http://darstin.com/userfiles/files/liwer.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/39594129061.pdfIn PDF document text
    • http://bjeclinic.com/ckfinder/userfiles/files/15250699186.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/fbake36sefpa9vn6qi37v0h4nk/gigiwajabedaso.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/62666932732.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/76974661047.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/11937786954.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_off0000d735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD735 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF47 16252 bytes
SHA-256: e470d3cee0e41b47317db20fa45074cae1cc18d3c571b98f077c7ecf75ff8ddd
font_02_sfnt_off0001190a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190A 10784 bytes
SHA-256: 81190960b025161dd9a188dc87979530b96db2c61c5dbb6ae6b07c0d0532b542

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