Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0099bad3c69f0a6…

MALICIOUS

PDF

77.4 KB Created: 2021-09-18 05:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d66702f710c3312252f6f19f08f2dd1e SHA-1: d8b16ae4ab6738ae0e32cccdd047fd9fa9405d30 SHA-256: a0099bad3c69f0a6286c669ba23e72ba650af0e276ecc88fe837bf4ba7bd7e31
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and presents itself as a ClickFix social engineering attack, instructing the user to execute a command. This suggests the document is designed to trick users into running malicious code, likely to download and execute a secondary payload from one of the numerous linked URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://robertbah.si/files/file/fugivugibijonederedeg.pdf In PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161342afd41cfe---luvisuz.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/60668294282.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/19072922332.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///kikudimafutanovozen.pdfIn PDF document text
    • http://quetthe.com/upload/files/96127379792.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/40644365750.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1630894570.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613405545c0ff---40132606822.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/20317705118.pdfIn PDF document text
    • http://coniperfumes.cl/js/ckfinder/userfiles/files/baxem.pdfIn PDF document text
    • http://unsersohn.ch/images/file/nomilupisaje.pdfIn PDF document text
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/femiribajelutadubizosip.pdfIn PDF document text
    • https://baglab.pl/galeria/file/31432620465.pdfIn PDF document text
    • https://cmottaviproductive.it/uploads/file/90246082811.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/cc006ac7cf332fc05e7c521fea7e2b64/31816728659.pdfIn PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/10749576142.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/fezoboxemudogesujarixo.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/e8f0b0f3a9817ed84331f492f7e9d724/82288323542.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/loterufakuguvutodalafanuw.pdfIn PDF document text
    • http://sun-dr.com/uploads/files/202109051019187757.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361c55274db---60784434346.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/nijazi.pdfIn PDF document text
    • https://iasvn.org/Images_upload/files/31658708276.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+bypass+wifi+login+portals+androidPDF 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_off0000cada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCADA 16868 bytes
SHA-256: e062f24a752afa56db06e583aeb8ec5656eb9782f2bf105e80cc813b88a518a3
font_01_sfnt_off0000f6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FD 10872 bytes
SHA-256: 9196b885cf59c3911ee1b405b093f5c8fce06d8267e8bcb9661c8505bf5fc748
font_02_sfnt_off00010fd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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