Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d55589cc28d7d78…

MALICIOUS

PDF

78.4 KB Created: 2021-10-07 22:15:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: abb68040fccf2785e278c2f5285570a2 SHA-1: 10750ba2992fd167e8e63b6b4c5670b7bae3555f SHA-256: 7d55589cc28d7d7892700eb62ade4deaa2e7517600400d0c70fb9e25cc6b78ed
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. ClamAV and ML classifiers confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://globalcircle.club/userfiles/file/14079222407.pdf In PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/bilotufirozakomezigaz.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/34299321899.pdfIn PDF document text
    • http://sententtech.com/file_media/file_image/file/3421424202.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1614532f797b11---naraloxadusotemugi.pdfIn PDF document text
    • http://goref.ru/files/file/83032868602.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/16748522571.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/28467399748.pdfIn PDF document text
    • https://onlinendttraining.net/files/kubamivejofi.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/51133678597.pdfIn PDF document text
    • https://geelaboba.dswip.com/ci/userfiles/files/33217560981.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/108214dfd8e45c902cc691e625c660eb/42692979558.pdfIn PDF document text
    • https://adoz.cz/ckfinder/userfiles/files/45110487017.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/91638577321.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/98445318102.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614d4b0d4eb28---56459286063.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/bemagaviponer.pdfIn PDF document text
    • https://srsatta.com/ckfinder/userfiles/files/jobeju.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/95929911989.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/ribaxanobenifikusuzot.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135b17b0dcc9---28989494509.pdfIn PDF document text
    • https://aashianarealty.com/file/43022707238.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/gusudituwuvujanemikanesu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=busta+rhymes+touch+itPDF 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_off0000ce43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE43 17484 bytes
SHA-256: 2bc675d123fe10a3b319cfef0c46d80c3cf0d27effad53e7ae52f3cb16b2f6e6
font_01_sfnt_off0000fbb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CD 10612 bytes
SHA-256: 6e6fe1abe70376925d49d8f42fbaa7e6252dca6f6fa1cb62ee44be2d75e55a8b

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