Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c3b4a4cfff151cc…

MALICIOUS

PDF

90.7 KB Created: 2021-09-12 12:08:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5276d91c67d2cc05b1dc5010c7da6b99 SHA-1: 7f3141e13b8de3a4aed8bf0f6302313cedcb2e2c SHA-256: 5c3b4a4cfff151cc5c64ff19367d4727d18c32de3424b9e663b77ba47810d5af
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document likely instructs the user to copy and paste content into a command-line interface, a common tactic for executing malicious commands. The presence of numerous links to potentially compromised websites and disposable hosting suggests a phishing or malware distribution attempt, aligning with the 'Spearphishing Attachment' technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://jensbrode.de/files/file/zuzafufanedinad.pdf In PDF document text
    • http://dison.cn/filespath/files/20210902124636.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/sk9olngr4dgjn4pj2ikfl6gdvs/wawese.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/61803630557.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/0bb4b015db75fb4eded736f4e607c5a0/nimawewasixus.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/totofumigojidep.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/munukakotuzijinin.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/72813956703.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/44731507750.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/topijuv.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/fikirolemu.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/94570315188.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/bbfeef6038f0b139c4f8602e933a0f34/feviravuterokak.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384a95eaace---ruson.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/wumatisataterapikezuxo.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/67245668028.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/dafavapa.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/78147702824.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161303d76a3f60---sapawupezaroba.pdfIn PDF document text
    • http://gelinyuanyi.com/upload_fck/file/2021-9-12/20210912141802592042.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/tamopirozela.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/posefumidonunawavedubu.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/mepawuzukijinerupakabo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=retrofit+call+examplePDF 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_off0000fdea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEA 18104 bytes
SHA-256: 5e3226f67346f2c9cebd4db45e8188a504ffa35c9d54ba7e4d87ac266566c108
font_01_sfnt_off00012daa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000145c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145C1 10516 bytes
SHA-256: 587da307851f53a365b146bdfee9328e5d94a73970ffeb1529a91900bee84ffb

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