Malicious PDF — malware analysis report

Static analysis result for SHA-256 baef6fca6bf9a50c…

MALICIOUS

PDF

74.5 KB Created: 2021-09-05 00:57:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 8f5aa7a4302a11cad5afe49de79a07ec SHA-1: 0c1529cf2a8b85557d23cb89921619e122ac07c4 SHA-256: baef6fca6bf9a50c4e9d551ba27831baa17b172369b4a603dc86c97a1c2e9bd2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The PDF also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final malicious destination. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/abbb6823502377fc96a9b176c3f88fd5/jukagikam.pdf In PDF document text
    • http://alarcon-v.com/editor_upload_image/file/lezaxoxovegotujobej.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b080b695056---jamudovekujesupotaj.pdfIn PDF document text
    • https://schlosshotel-murten.ch/userfiles/files/xagurojevevorotep.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/2cd45733bb304968a5f9082295c1924f/sivad.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/lejujirepi.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/74482218613.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/a8af1bb417a95293496cc621fecdb3c0/57964953.pdfIn PDF document text
    • http://bacsionline.net/userfiles/file/83784037430.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/1170223396.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/t3vjdfcfu6784jlfp1hs1ecibq/fimusuridopogad.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c879237a223---8200992228.pdfIn PDF document text
    • https://truonggiangcompany.com/userfiles/file/42041844200.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/39614174943.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/9416761943.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/lekoxodujosevozutugove.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/o6470cdoac3fmsv7514ems4lng/mezinasedesis.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5877390502---mugom.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5cb81a440---rigonakuvixisepa.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160982f32141d8---98866120400.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/de6c6decce4768ae18eb40a1c583359a/83955127832.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/85693056972.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/nijedolovuxaritofigajox.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/92998699986.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=properties+of+piezoelectric+materials+pdfPDF 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_off0000c208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC208 10736 bytes
SHA-256: 664ce025758a0b9e0ead0115f8e41b75a3ed9093b2d7b00294dca1cadb6bf56e
font_01_sfnt_off0000dabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABE 16036 bytes
SHA-256: 8c59c4fd3ac6100dd6150f1a5c589619c316ebe6ba9da877be252e43a1c12dd7
font_02_sfnt_off000103c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1