Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fe3234c4bc42bae…

MALICIOUS

PDF

74.7 KB Created: 2021-09-16 08:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: cd2c29aa7332beaad6ad535d41ba2416 SHA-1: 43bf9e88ca2c3587c12d7f59907934d2929da961 SHA-256: 5fe3234c4bc42bae62646c26762a9d48360fc3c8dfd7104177eab6aaf2b59dcf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document containing embedded JavaScript and numerous URLs. Heuristics indicate it functions as a link farm, with many links pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://awards.nl/img/cms/file/11422744822.pdf In PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/putumibewilutem.pdfIn PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/97713804620.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/judadowananadidalolo.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/wobexupidalunagujubazopej.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/melebari.pdfIn PDF document text
    • https://totalmediasolutions.ae/ckfinder/userfiles/files/15247449871.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161408f7f8957a---rizotekisokol.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/6182b1bcb5b8a4087fe242ce58ca49bf/50077897568.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/a8410fe12fbff1f1573c2b3ab63f8fee/69999971356.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/56902577265.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390eb7923fc---57032896452.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/13889364779.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/35427593685.pdfIn PDF document text
    • https://pmms-online.com/assets/file/5429068316.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/19600300135.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/runom.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/52123175866.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/gorewik.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/24649343067.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/wutoneb.pdfIn PDF document text
    • http://geonatlife.es/ckfinder/userfiles/files/62414721040.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=android+studio+javascriptPDF link annotation
    • https://www.thc.gda.pl/ckfinder/userfiles/files/xerada.pdfIn PDF document text
    • 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_off0000c124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC124 10608 bytes
SHA-256: aa43cc4b8130668f1b1e0774aba15aba6e0216fcca8e7944bf20496f7481278e
font_01_sfnt_off0000d989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD989 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f19b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19B 17004 bytes
SHA-256: 3382d079e2a9c4d694b168b7e4eb5f8e455612b906d84ac2222145ef11364033

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