Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fd50829465ad083…

MALICIOUS

PDF

73.0 KB Created: 2021-09-12 16:58:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d6be38ca134d0c2d8200bdd70f4e5dac SHA-1: aabd5ce4a441672d4835c5ef5a7e3b5463c0ddc8 SHA-256: 5fd50829465ad083792100a6e0e2aa1b21551daeecbfb50d306bfbc51f56fe20
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are structured as link farms. Heuristics indicate these links are likely used to direct users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly suggest malicious intent, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://tutorlookup.com/ckeditor/ckfinder/userfiles/files/23413481951.pdf In PDF document text
    • https://benhgout.net/uploads/Files/file/wegedowupazunepij.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/88583169101.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/xawovexagi.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/84a5f85316b501e9f25e4b247d0a5917/bujosakajimezigatolinetu.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/64975661648.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/kosegatewazarokawagek.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/16013652701.pdfIn PDF document text
    • https://anakmeong.com/contents/files/fenulijop.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/wedukido.pdfIn PDF document text
    • http://belniig.by/public/file/muzodakov.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/82595350568.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/56988989516.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b74b7c6877---welofetesotewikikosi.pdfIn PDF document text
    • http://www.pvvc.cz/files/42294627364.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/15894105678.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/lebunetabopubapixisum.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/jivufijumubasimolado.pdfIn PDF document text
    • https://2winit.com/Files/files/bakerapuripilibewipuxor.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135111fc96da---44473883491.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/xudumenisewidojijefak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=app+creator+24+tv+apkPDF 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_off0000bd92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD92 16308 bytes
SHA-256: caf4e6cfb3ce8dd41e5d65ca4b639ed42a9bc743032c8b37da0b5dbc924d11f8
font_01_sfnt_off0000e776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE776 10296 bytes
SHA-256: 9d3859bdbb8b171ce0609b43c61c69691ae01f8b8f8ac279255b3e172b423fa9
font_02_sfnt_off0000fef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1