Malicious PDF — malware analysis report

Static analysis result for SHA-256 a948d376c05ef2f4…

MALICIOUS

PDF

71.2 KB Created: 2021-09-29 14:55:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: effdb09eb6f3ec968116bff6becf76f0 SHA-1: e29f38376a7a4b1e27f520fd9f4f5ee053bb40b8 SHA-256: a948d376c05ef2f4beecdfb5d536bb736cb2bfea23727eb1ea9a4c6d2b670602
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is part of a link farm pointing to numerous external URLs, many hosted on potentially compromised or disposable domains. This indicates an attempt to redirect users to malicious content, likely for phishing or malware delivery. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://garglob.ru/uplcv?utm_term=tailwind+ui+components+free PDF link annotation
    • https://agermag.ro/mm/file/rebax.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/dusowazarajunero.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/60592952607.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/62566677619.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b549eb1f0d35d7c678533c57da5984a3/bawoxexulujamisafivesed.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/2663070018.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/manimidizapizunul.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/6042413538.pdfIn PDF document text
    • http://rimini-portal.de/bilderarchiv/file/zikolun.pdfIn PDF document text
    • http://lollanaclinic.com/image/upload/File/34167346808.pdfIn PDF document text
    • https://artdecor24.pl/uploads/files/parirerijunefepuleru.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/47095712866.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/86648824430.pdfIn PDF document text
    • http://okna-kursk.ru/page_edit/_samples/userfiles/files/93861808478.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16136c73bd9095---rudegubikefemoresole.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/nizobas.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/66652579674.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/gunimelumirotepadaziw.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/20003589913.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/tiwatexokobulezatuveze.pdfIn PDF document text
    • https://truonggiangcompany.com/userfiles/file/84451793164.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/sukozi.pdfIn PDF document text
    • http://studiotecnicostradi.eu/userfiles/files/kijitaziwibubema.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/58dpje3nr6fmls8qk6a26hskqq/19674806963.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/zibemositasa.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_off0000b3f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3F2 10928 bytes
SHA-256: d88c36c9dc2f3767b55e87eab6ffa66aaab2fb803273856cdbd370e1820a6f9d
font_01_sfnt_off0000cd4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4B 16240 bytes
SHA-256: 1bd740cc8c8bbce8cd02b9bb2a0f2dbe6d9169ffe1d563fa7f8575116da23aab
font_02_sfnt_off0000f65f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1