Malicious PDF — malware analysis report

Static analysis result for SHA-256 05ee0557455ea2c2…

MALICIOUS

PDF

74.0 KB Created: 2021-09-09 04:58:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8a83bf2033d26fb9490b3f757fa8eae6 SHA-1: 7e4d6affeb80a4e426234cdf381479683792decb SHA-256: 05ee0557455ea2c2fa3b6ea811026e8c2b0d52bfa581f10afbcccf4e37bec210
204 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, flagged by ML classifiers and ClamAV as malicious. It exhibits social engineering tactics by luring the user to install a browser extension or update, a common method for credential theft or malware delivery. The embedded JavaScript likely facilitates the download and execution of a second-stage payload from one of the identified URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/1195dteupm7d5uea343rion1am/buzexunefuzejazevijodoguk.pdf In PDF document text
    • http://cauthangdep24h.com/upload/files/zawaxexalifumowabeve.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/gutadaf.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131feb54f9cb---relalukixonitoz.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/56316857412.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/cbc67c1f80374c7fa867f16c119aa071/50317562763.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/sonupozi.pdfIn PDF document text
    • http://gammatradings.com/userfiles/file/57901116688.pdfIn PDF document text
    • https://artcorner-fiberglass.com/userfiles/files/98265423988.pdfIn PDF document text
    • https://ausztriasi.spawellness.hu/upload/hirlevel/files/wixebukoxenita.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/fakijikapuziza.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/23952823360.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/37782317502.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/15230903145.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/60191836913.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/xuforonigomudiru.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161339efc707fa---saxekola.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/38145005912.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/91240845062.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/pusar.pdfIn PDF document text
    • http://marklaliberte.com/fckupload/file/40669925702.pdfIn PDF document text
    • http://tipiland.net/upload/file/wafitedebazi.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/63251705566.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/40389214746.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=make+apk+from+installed+appPDF 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_off0000becd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBECD 16756 bytes
SHA-256: 02c1529c016afed5b6db6e4d9fdf19281fc3dd41a3b2f38a6aff97e5f45be17b
font_01_sfnt_off0000e9f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001020f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020F 10744 bytes
SHA-256: c511a40680f7b12f07ca034b77f048538e9774fb6383f9520c5a8cdb166cee1c

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