Malicious PDF — malware analysis report

Static analysis result for SHA-256 db1bd4672424acba…

MALICIOUS

PDF

93.6 KB Created: 2021-08-08 22:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8b3770803c2e08e7f91f2bdeab6fdbaa SHA-1: 75b4a60d02eee2347f04370a70ccb6f4d9aa20fb SHA-256: db1bd4672424acbacb8be1eb1584a9e2a488c34673246a9de110c479a7e0ca71
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggests it is designed to lure users to malicious sites. The primary function appears to be redirecting users, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://bbgpiti.com/userfiles/files/sitemudu.pdf In PDF document text
    • http://cuboni.com/uploadfile/hong202107260048479509.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/tfd1i7e6nrnot13366vi4ug2t3/jifepuf.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/k2g60cnvmchqghbrmijgtnam7e/81735089207.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/19149673271.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/43622725382.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/gonokitijegaxi.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d60baa210f---rixasubijezakirizoda.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f8fa96cc9---92042862829.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd6d1d3ae2---94674812959.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b89e6a734---bodelakerarodikevaxi.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/fememukekigitukena.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/nejapigaruruxumabi.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/79940645114.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf969a38f2---fagavijadorin.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/fifomudodi.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e265c4b7b---jokizapabokadojuvaxa.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/v458p5cth9lq8epca82so3edit/58324961945.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/16064177736.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/82893162552.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/kadiposigusimamalat.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e2fba67e5---43530147356.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/b880fcbc4657501525f3b36c28257556/3852094.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c53cae92961---6439222959.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/67842317450.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8a75e8cb01---6455152786.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=parenthetical+phrases+worksheet+pdf+with+answersPDF 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_off000108e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E8 10896 bytes
SHA-256: 2efdb18a868a50d1d4c2ba25792f83c6e527eae370e5555fda73657de92acb38
font_01_sfnt_off00012219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12219 17348 bytes
SHA-256: 38629346c7f0d5727e5c77eebdd11c1f144d8b5e0a334743795d91f34dd19588
font_02_sfnt_off00014f92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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