Malicious PDF — malware analysis report

Static analysis result for SHA-256 4892b8d16332ba43…

MALICIOUS

PDF

73.6 KB Created: 2021-09-19 16:09:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a0893865476aece11554a0b29aed1171 SHA-1: 5b353a709d8fcb6f1cd7bbb92e4e6e37d39d3df8 SHA-256: 4892b8d16332ba43edbc57372b886f2f26b5f93eb4f4ff13d8ebb6b23343e79f
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and is part of a link farm designed to redirect users to various websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://kedehg.com/ckfinder/userfiles/files/jidoxamujig.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/144f9125a2783daad6290668cb8cff12/63640255115.pdf
    • http://merlegdoktor.hu/tmp/jiwopegikerolofuki.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/ddbad771a6c94c79743cd4e176369699/35236284337.pdf
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/pukibamin.pdf
    • http://jhdljz.com/userfiles/file/1631987062.pdf
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/19901374141.pdf
    • http://rasciindia.com/firetech/ckupload/files/41826790021.pdf
    • http://maudchristan.nl/ckfinder/userfiles/files/80672428625.pdf
    • http://greatwalledmond.com/ckfinder/userfiles/files/nejedifobidigaradoku.pdf
    • http://piannocreativo.com/js/new/fckeditor/userfiles/file/puxexisovot.pdf
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/90618997021.pdf
    • http://goref.ru/files/file/46082446397.pdf
    • https://qatarsecurityservices.com/public_html/userfiles/file/tagib.pdf
    • http://stellarp.com/userfiles/files/33610920572.pdf
    • http://baigeleather.com/userfiles/file/bezajatij.pdf
    • http://isystemlab.com/admin/ckfinder/userfiles/files/luluduruwedipijo.pdf
    • https://sandipkumardutta.com/ckfinder/userfiles/files/panodowopurezajapanubutof.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fb49ad6f4---57473275853.pdf
    • https://cowichanseniors.ca/userfiles/file/89977906124.pdf
    • http://sportyou.fr/ckfinder/userfiles/files/62927014972.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16134898dc6cdb---sawogagojawipo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=100+rules+of+english+grammar+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bdbd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBDBD 16792 bytes
font_01_sfnt_off0000d5cf.bin
58a931231c047185c7cd61fe34b8605cfcf9ecf5cebc8b3c67c94597c10429d1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CF 16212 bytes
font_02_sfnt_off0000ff74.bin
1c59755ecae6d650ce1e7fba3b7b493c296d95f41f77463cdc9e55ae9edde22f
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF74 11024 bytes