Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f4d3bb1c48462de…

MALICIOUS

PDF

82.5 KB Created: 2021-09-09 15:13:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4ee508765403fe9d2a923a21296ab63d SHA-1: 0df8143f68329f3e8a2ec05290602e2dbdefb509 SHA-256: 5f4d3bb1c48462ded9374ae4b7d6b527a0c2e1aa4100d15765d18c9439c7c016
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 disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://cructi.ru/uplcv?utm_term=digital+signal+processing+proakis+pdf PDF link annotation
    • https://xtrafitcoaching.com/www/images/files/10210724196.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/sunivafuzimesezi.pdfIn PDF document text
    • https://aashianarealty.com/file/zifidesogadunanodedipo.pdfIn PDF document text
    • http://anm-av.de/uploads/files/zonedodubozetebak.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/lixeguzopudufopetapipomeg.pdfIn PDF document text
    • http://birdwatching.sk/media/file/kazejib.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/fusirevesoxotaxoromew.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/biraresaxekegufotuxe.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/39226400561359189a8f58.pdfIn PDF document text
    • http://ecohouse-lab.de/userfiles/file/mitabezifetetil.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/rinodosizazajoz.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/62654775464.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/31bc2b8e156033c79aa7faaed1cdf1d0/69083256871.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/abec9d1724cb5ab01b74b2388d4f4203/sogokigujonomatiman.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612faa4b3a43a---naretituwizulezus.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/16868541836.pdfIn PDF document text
    • https://taptigrihnirman.com/singhania/downloads/file/67925510658.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/gujizusunibirijujip.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/xavixelafote.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/kovukurajixubulamituru.pdfIn PDF document text
    • http://friulanamarmi.it/images/file/81865395418.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/9461493647.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/delowejapa.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/94152617460.pdfIn PDF document text
    • http://eskuvotoszkanaban.hu/editor_up/37185538762.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/bamegadekurejor.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_off0000dd18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD18 10888 bytes
SHA-256: 8f7c42ccd0773ea76fdcf4c1af0c176130ec84379910cbc78f1adc60398afa4f
font_01_sfnt_off0000f62e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62E 17660 bytes
SHA-256: 4210c75c9905665c4d0e2904d0b396365a3d17de464fc133fe76eb5a086b23a2
font_02_sfnt_off000123d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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