Malicious PDF — malware analysis report

Static analysis result for SHA-256 bba1acd7fac986b9…

MALICIOUS

PDF

69.6 KB Created: 2021-10-03 06:34:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d09591524f67d0ff3da4f311f5391aca SHA-1: f4d630ad9e17d838ab57f13b33c3e3dfa60879b5 SHA-256: bba1acd7fac986b962fad2a058f252f0bbebc4ee6fb42214519108acda324d13
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish or deliver a secondary payload. The embedded JavaScript is likely responsible for initiating the redirection or download process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/e4eb9e819439e1e708a42d200fe68073/suzisagodononasaxevuki.pdf In PDF document text
    • http://chinalabware.net/d/files/32655872490.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/9695165276.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/juvelexokinikifiniwul.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/13651671914.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/55654441440.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/pufilorudatu.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/55893185444.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161394747cf89c---jikikito.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/mujadapaka.pdfIn PDF document text
    • http://icoenergia.com/userfiles/files/60609705780.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/gesani.pdfIn PDF document text
    • http://apothepharma.com/upload/files/29072944490.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/26b7f95e09037080d5a25349ec6479ad/60365329170.pdfIn PDF document text
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/zatazivuleganoloja.pdfIn PDF document text
    • http://tyextractor.com/d/files/28058239240.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/64071735047.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/xawamiwudujiz.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/16178233420.pdfIn PDF document text
    • https://kuwaitpolyurethane.com/ckfinder/userfiles/files/53804456575.pdfIn PDF document text
    • https://micro-logic.ro/images/uploaded/file/navikajodaguwaz.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff78a19321---mukizubu.pdfIn PDF document text
    • http://elektro-galerie-hamburg.de/userfiles/file/tenoxu.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/110b1f28a3976f549064c384b57a0f62/20128630447.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=oxford+junior+dictionary+free+downloadPDF 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_off0000aeb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEB0 15376 bytes
SHA-256: c7b997b9593290c8f7d34b701853b6889fd8a117f081eced4c775552509ee69e
font_01_sfnt_off0000d58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA6 10856 bytes
SHA-256: a598486adb5111e6d9b1c11ae2ff9bc81fb909b0b237e6174bfed45b83f529eb

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