Malicious PDF — malware analysis report

Static analysis result for SHA-256 552cc7939dc299e2…

MALICIOUS

PDF

87.6 KB Created: 2021-09-14 00:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 24246e78dce08dd241e0813bc0eef6db SHA-1: 4775b9d1cbb473f569ef2837979db1401bf051b1 SHA-256: 552cc7939dc299e2cf71bd0180b23036afcc9c14c55b58e82318115121b9befc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a link farm designed to distribute malicious content. The embedded JavaScript likely facilitates the redirection to these malicious sites, contributing to a phishing or malware distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lishasurgical.in/ckeditor/ckfinder/userfiles/files/rimobawunewonizavuj.pdf In PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/kufudinim.pdfIn PDF document text
    • https://blogsma.com/files/tudonavufenipakamezavi.pdfIn PDF document text
    • http://soojuspilt.ee/files/file/9149492280.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/llb6ge8melpm0dgc0mgpa9g354/84974900302.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/sazufisonitibupoka.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134169fe590d---zuxis.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/45337188166.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/sujaninaga.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/28853184172.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377b50a864b---jekavubefag.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/90305490094.pdfIn PDF document text
    • http://ccshecea.org/upload/files/4645813543.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/98385668472.pdfIn PDF document text
    • https://advik.net/userfiles/file/siwulikegekovukebakus.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/38443635535.pdfIn PDF document text
    • http://bdnchem.com/upload/files/69861395209.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/wixime.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/18465433486.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/48001261996.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/77479363394.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/39466289393.pdfIn PDF document text
    • https://radio-clipa.ro/userfiles/file/vuvapanisinelelulibev.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/50852181326.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=dilwale+movie+watch+onlinePDF 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_off0000f4a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A3 10380 bytes
SHA-256: 6e7ce51a5183c98734268acd71f8f66cd212df9badb95a7f0d8c3dbae762dabf
font_01_sfnt_off00010bf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12405 17596 bytes
SHA-256: 476833ec49caca04d78f0c8d543b4d522416948b9601204fbdd608893ba2ed7c

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