Malicious PDF — malware analysis report

Static analysis result for SHA-256 e393d90a062e9fcd…

MALICIOUS

PDF

92.8 KB Created: 2021-09-03 04:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f6260d859b25850c43702a786f2b5a10 SHA-1: 44ecaee5398b6dfb2a25065b484bc638a5d75ca3 SHA-256: e393d90a062e9fcdbe9972b9be0ec8c03203468bd412109968008e7c161c9212
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other domains, likely intended to lure users to malicious content. The presence of multiple external URI heuristics and link farm indicators supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://neoneophytou.com/ckfinder/userfiles/files/69145487068.pdf In PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/8f5d9b978f2952313cd9e4f0eebeaa64/67679201270.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/d8bc12e5cb6d1eb48694cc1fc6d9aa29/32281319830.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/9d06s9irc78j5jk1gocsabgbli/tedunitutini.pdfIn PDF document text
    • http://cfacgroup.com/uploads/FCK_files/file/virutolimawamukesub.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/mik8k0i34ute9gr060n62p079i/bopabu.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/73877042321.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608808166df14---27635779271.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/jojaborepaxefewitewi.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/2b58fdfee54efd82728d059207def39f/10746631003.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/86qbh5aqlvk58cjnha2cch4k13/vulaxufadubokajo.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a521f8f30d4---nexugibofodudatirofolewu.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/tue4d644t3opqtd2d1b2rh85vn/42239911995.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/37147061c066a3d0704edb8caa33f29b/rodobokinojusinop.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/jogixozabikilipur.pdfIn PDF document text
    • https://tranhdaquyhn.com/uploads/news_file/63122689916.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/53516100967.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/zewalupete.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/57031371786.pdfIn PDF document text
    • http://dso-fuzine.si/docs/29094016227.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72cdb55904---85912513414.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/67629038673.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/53feea21766e4622e8e6e110957f75e9/foduxetufuduniv.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/85236493521.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/34635760759.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=incredible+journey+of+the+butterflies+worksheetPDF 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_off0001027c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027C 11024 bytes
SHA-256: 7f24a5cf668c2addd32d1fc781c18e54ff3c35108b340fad2f61567a548f9103
font_01_sfnt_off00011c13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C13 18432 bytes
SHA-256: 852e9a4b0d149f23507b43de5b3e2f9600c5ac7cb21f73296f6026133dc3f617
font_02_sfnt_off00014bc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1