Malicious PDF — malware analysis report

Static analysis result for SHA-256 89ac9e02d316e98e…

MALICIOUS

PDF

76.6 KB Created: 2021-09-07 09:11:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4dc87b0a5d426d265a3b5f61725d3846 SHA-1: a2f05c49a854215a4e771733af4de9223791280c SHA-256: 89ac9e02d316e98e089e5c631d21e193b5c472f65b3e3d8bdd95abacf59fe7b0
96 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress sites. The primary URL suggests a lure for downloading a 'free fitness guide', indicating a phishing or scam attempt. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://crysiq.ru/uplcv?utm_term=telecharger+guide+de+musculation+gratuit+pdf PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c87f9f5c2db---71836937879.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/q2iup80nvvdb2jjq8rji0g3hi4/32870551457.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/sjmjhbr2v9cvf56im5c0didv5u/76464123081.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/32830728789.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607d66b072ab0---90894766180.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/d89517bf4d40ebe3af089f44c1aa413c/purufasuvinetawuvisiwosix.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/mibozuzorugudonof.pdfIn PDF document text
    • http://cctsjwhs.com/clients/0/08/08395bc9c2b8280888f0dabd04457394/File/nixujagusabesisigufan.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943bbfac2be---76771152578.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/18255300978.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160be721905986---tarotuwimugozewinure.pdfIn PDF document text
    • http://lhs75.com/clients/46937/File/fujatatejukesawu.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/73029541928.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d2c9b2c94e---64478163265.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f408bc968f1---60014712369.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/pefowobiganupomaruwuxitis.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/wasikilepuxubenunepabo.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16080089cc5b20---15747930944.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/5f2c4e8af1ae138d582df136291390f4/73583880025.pdfIn PDF document text
    • http://riph.pl/userfiles/file/segewogivilezoramugi.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/34846001311.pdfIn PDF document text
    • http://yuha.be/_files/file/beranaselow.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/nutusiditogurulaguvaza.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/valegeferusekapuxubituj.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_off0000c68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC68D 17268 bytes
SHA-256: e43da826ddc93dffb54adc9e02183c469e1d61a45ca846bc0f0086b5a35b9837
font_01_sfnt_off0000f2a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010abc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABC 11132 bytes
SHA-256: 5137a865f965d1f5ee454bbcc665a4f6e43bd9413d7ced2a7bc71c20aca507fb