Malicious PDF — malware analysis report

Static analysis result for SHA-256 f79b91551e47eff3…

MALICIOUS

PDF

79.8 KB Created: 2021-07-25 15:29:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 85621e6c7cf0d47bf30ab5cc77adc117 SHA-1: 47968f1370693a41a6e8ab3392f4ae77bab8bdd0 SHA-256: f79b91551e47eff3f9dfda8e8fa943ae76ad0598d1cc1700a8b1d001ebf10d51
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, directing users to compromised WordPress upload storage and other potentially malicious domains. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://groupburuemas1.com/contents//files/suxasesirepuxewigatux.pdf In PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/180ab3b15f099c7e4a319f0062f22d16/50163593584.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/gopuzipexaredolejasojaz.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/35767674412.pdfIn PDF document text
    • https://educhina.mn/editor/files/23657626740.pdfIn PDF document text
    • http://dostavkaturov.ru/files/file/mamagikokogejazama.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/f88b2ab3fc6b2d13da714dd24b99e9ef/kepubanal.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202107010033026728.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/7143885d151439d9248d9bdd8b125b4d/36592753788.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/478628dcd5e35b81f4aa9b31f998d09e/85869602244.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/salimagenitowuwofabedosub.pdfIn PDF document text
    • https://migger.dk/userimages/file/damuzowawosizamegunixegu.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/zimirilavoraputewitukaw.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/tobaxewafuxodudesozuvuri.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/9cfe45c412306dfe68d86137b14b6972/ralukagorisovutifazona.pdfIn PDF document text
    • http://maihome.hu/admin1/file/21384295742.pdfIn PDF document text
    • http://prograsifkalip.com/files/92047632101.pdfIn PDF document text
    • http://ciskmv.com/css/file/polorosijaba.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/13713539804.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/ij8m0sm6kpfau2rl0a6a200m4r/darazezetupesi.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16077b1e05ae16---fizewogesexasox.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c2627f26efd---pexosasulopawilazovidag.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2791be8c80---12816365934.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/71880559286.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/kedopuvokafenunotebatuwor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=ultimate+country+fake+book+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_off0000d075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD075 17716 bytes
SHA-256: 02e510a3f9d7c17efcdb6fb6522e3bd354566ef8175d83294b5317503d48e555
font_01_sfnt_off0000fdd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F0 11068 bytes
SHA-256: 3d5c2031d9f29b89ea4990b351136011a3d2589055446010b6b44afa5acfbec9

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