Malicious PDF — malware analysis report

Static analysis result for SHA-256 53c08000786d5cd3…

MALICIOUS

PDF

116.0 KB Created: 2021-08-08 10:43:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: ae132f9f4bd74805912a7875590a6e2e SHA-1: ea7940bd38fffa80e4959820c4221917b37747f3 SHA-256: 53c08000786d5cd310f45e3b6d93ade25fb5de043e79545160c18af5312ba9b9
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution attempt. The heuristics indicate a browser extension installation lure and a fake invoice, combined with ML and ClamAV detections, strongly suggest malicious intent. The embedded JavaScript is likely used to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9852

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://clickkedai.com/userfiles/file/65035236230.pdf In PDF document text
    • http://location-appartement-venise.com/italie_documents/files/donimexosisosi.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/depozanipilufoxebekenisa.pdfIn PDF document text
    • http://thevelascofamily.com/clients/11614/File/rugezoxozubik.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/1975272959.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096650c58190---97368449654.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/91365f805120a315170b5a4fd3dcacb7/vilowenib.pdfIn PDF document text
    • http://kusadasidentalclinic.com/img/userfiles/files/jupefarigik.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/vafivor.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a03558cee---14753199220.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/rurolusu.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c1caef7e7---xuvule.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ee5bf5de3f8---vawowepivilisomezilural.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/44a72bd7f3515357330fa301f3b6c948/55475673324.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/dimiwomixudevuzekewu.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609df217505f2---25577682855.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a114e970fd9---17748714619.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f56e9c6cd69---pofileterobuw.pdfIn PDF document text
    • http://gumberryoleschool.com/clients/33891/File/57800189179.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/xobeponotokigarejuwi.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/tomozudoxe.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/57098937850.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/a087a5829f4bdab8dc9651ef8251a316/nabogevorutujasudukudim.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/gevenir.pdfIn PDF document text
    • http://solsethreunion.com/clients/f/f5/f56c6d7ba488b74ef40bd02d3fc4d0b2/File/fapadudugusedunat.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/73168015824.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/hdp9a4fi6r5c5qados14m5rt2s/30614789816.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=yontoo+1.+10.+020PDF 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_off000162a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017abd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17ABD 9744 bytes
SHA-256: 3a9485b88eb6fb62bbc8905f0545600bb0cf4077b5c7a0007a3de68bb9bce2dc
font_02_sfnt_off0001902a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1902A 18544 bytes
SHA-256: b1e5f9df9cf1bf40b72f316e34ee7515bc01df9bb1f64c242a48489915e2fa61

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