Malicious PDF — malware analysis report

Static analysis result for SHA-256 433ef215cdfbb4e7…

MALICIOUS

PDF

93.9 KB Created: 2021-08-22 02:28:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7baec213e36fdee4423e8d1f07d18c7c SHA-1: 6a2e30652880705fff347c031a33ae5ad83af29c SHA-256: 433ef215cdfbb4e7eb7bcf9fb48934f13c524dbc6014828d6dc93950c2503cdd
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is a PDF document that employs a social engineering lure, instructing the user to install a browser extension or update. This is a common tactic to facilitate credential theft or malware installation. The presence of numerous external URLs, many hosted on compromised CMS platforms, suggests a phishing or malware distribution campaign. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • 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.
  • 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://ketchas.ru/uplcv?utm_term=how+to+lock+cells+in+google+sheets+2021 PDF link annotation
    • http://sistersaviopublicschool.com/userfiles/file/29376142195.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/9vc0bjoqrd1l1gppf1ihvb9jf9/84324400832.pdfIn PDF document text
    • https://aokman-drive.com/d/files/25984102842.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/f853e764a3a4a8d86a54ef53af06f554/zuwelevemenevuzij.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcce7a8c7ac---67849616081.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/33634338582.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/52181543055.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/vagusaxajoz.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160753bcbcdef9---99548238399.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/4b3ab2761bcbbc4732bf8cceb8046abe/28356361723.pdfIn PDF document text
    • http://texmet.pl/userimages/file/nibureferutovufarugunutal.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/nisinakuwezomipudakop.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/pelexi.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bd0244930---59192381381.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/41778368407.pdfIn PDF document text
    • https://panificiopasticceriabattaglia.it/file/36912108745.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/59435262525.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/q187bf81otr914n6kjfcogouag/9777133446.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161004ec2b46e6---9184571026.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609736879ac8b---23013348861.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802cf306b4e---80400617956.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_off00010b50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12367 10712 bytes
SHA-256: 4c5875eecbd2898c276b1b2c04b264a750261d6707495485b5dd62e9d10bd7b3
font_02_sfnt_off00013c05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C05 17676 bytes
SHA-256: 1a196249b63cc9b86452013d2e96e22657f6b88c7cf97a65dd8bcfde19498dd1

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