Malicious PDF — malware analysis report

Static analysis result for SHA-256 c064cec8112960ab…

MALICIOUS

PDF

73.9 KB Created: 2021-09-04 15:45:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 45640e2c53baa22b72814e8857501807 SHA-1: eec49ed68179026076aa826369d8f251ce67570a SHA-256: c064cec8112960abb2680e03d07d74afd3d039c10cb57c21b6c035f04fdc6770
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious. It contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm or phishing lure. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. No scripts were extracted, but the presence of external links indicates an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://archism.ru/uplcv?utm_term=code+of+ethics+for+engineers+pdf PDF link annotation
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/kufipodobizevewoviteneki.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6955367a86---70787574556.pdfIn PDF document text
    • http://latexindia.com/userfiles/file/metediteronuwuwa.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/setovobekopabevev.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/321d5a96a379e5a8cdcd3b0a4117d98c/24318748322.pdfIn PDF document text
    • http://cegled.varosom.hu/userfiles/files/10324084387.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/44854256111.pdfIn PDF document text
    • http://coffee33.ru/archive/file/32882629548.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8af299998---13009363124.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/d27ucpbbhs9rhp6eoinb2ci5e6/27640101814.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/576ab90e1f3de3cb83f07ff7b68dd253/3532558223.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16087558ecd6a4---damoxezuzominuk.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16081b64056e94---bevajulisut.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/153321ba56b628f5af416b5094b519aa/39751977472.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210625_5EEFC6AF1C3AEB69.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/32629601986.pdfIn PDF document text
    • http://groupkaishan.com/d/files/fepip.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/46f3123765a27509e224e42777b00a27/bilizomuwuwibanegutozepa.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/84580683361.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112e6d5d0682---kebubajoruwipiluf.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/ligidulagituxepor.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/6f167fce9d5b85169c6a199fa7e3f9c0/72691764711.pdfIn PDF document text
    • https://digireg.es/upload/19607701007.pdfIn PDF document text
    • http://globomax.eu/userfiles/file/56043029731.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_off0000c117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC117 15912 bytes
SHA-256: aea089c790da34b28a8362734a7f3ca2b5c9d84540fed8811d7c403d3a6f4c1a
font_01_sfnt_off0000e952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE952 10724 bytes
SHA-256: 34ce1f08713dd7128ce3c879f23c6a77d5946630457593ce52a438c2a31ef0e2
font_02_sfnt_off000101b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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