Malicious PDF — malware analysis report

Static analysis result for SHA-256 d68862b188f4da43…

MALICIOUS

PDF

83.0 KB Created: 2021-09-05 07:28:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d5863532879cc287efd19c700d8d3054 SHA-1: e537cedfa5afb3c34b5f2b9c82a4e4fa0dcfa62f SHA-256: d68862b188f4da43c26479b80f5103aba1fd4abfbf550e311ac07db86d80d66a
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous URLs, many of which appear to be hosted on compromised WordPress sites or disposable hosting. The primary function seems to be redirecting users to potentially malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://pelicanfinancialnetwork.com/ckfinder/userfiles/files/bajozijawar.pdf In PDF document text
    • https://penzion-palice.cz/content/76228120271.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210609052146.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3016bf3c89---rovidegi.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e237c71f709---91816462073.pdfIn PDF document text
    • http://siblom.ru/files/upload/file/66762691629.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608922e4befb7---pozovukuturiker.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/16lbjt9vas0ifk4c1vgvbrkose/9512422751.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/totebimexujofuzugume.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613257afbf37b---lulakufiraretis.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/47577178896.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736f6e5478a---fatimawezo.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/2739113563.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/70510968202.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab4089d0fe---8893043818.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/50436052280.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea70325fea---56244544198.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/957499a2705b65a13c8d82ec76934598/77880701084.pdfIn PDF document text
    • http://adamshs-pdx.com/clients/d/d3/d3c120c733f7363e2cdaef2cff5f3687/File/pazorixejosojikevezuwota.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/roxojawonaduxorizumo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=ada+title+iii+technical+assistance+manual+pdfPDF 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_off0000dec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC5 17904 bytes
SHA-256: 02f9fe7d8b1b0fefec5509202bff13fe2b757d07ebc12d03a7503aef9cd0c352
font_01_sfnt_off00010d97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125AE 10744 bytes
SHA-256: eacb55f3107a20c237f20a572a863e5d3209673952f72c2ad066adb87cf1da0c

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