Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f0faf9084788769…

MALICIOUS

PDF

87.4 KB Created: 2021-09-16 15:19:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d6befa92bdc01ebc16b25b6991b53aa3 SHA-1: bee323d14e41c0d482c508e45f98daad2c7e11d2 SHA-256: 3f0faf9084788769649a181b4218b573f97db21cca0098c912e2e0a3a9e1e204
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external links, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the execution of malicious code or redirects the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://irlanc.ru/uplcv?utm_term=transfer+app+game+data+android PDF link annotation
    • http://aminotp.com/upload/files/riwipiboxukinatumuvawodit.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/98485707280.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16139777010bf9---nujezutukubimomuwefigen.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/29515731433.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/sitojutiwaxekadupufew.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/gaxamodadegax.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/78246165860.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/goxeji.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372e9e79cb3---diporelawa.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d702761f6---jomidapebikasoso.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/29338723891.pdfIn PDF document text
    • https://anglarill.net/userfiles/file/26832850057.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///wulilujitexasike.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/92077989496.pdfIn PDF document text
    • https://amgaa.org/temp/files/36655824411.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/34106826968.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/1232016388.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/no3lh1furi3o7bvo40qfl4c4ad/digunux.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/pulewikenegovixumedisesof.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/xakorilo.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/08463feefdb4a0c23ebf497318a6a4bf/rojakiwutew.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/togogurunesazadimopunaju.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/nujubakamizo.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc8355b397---busuzibegogujuwopudiroxod.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_off0000f171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF171 10760 bytes
SHA-256: ba03e5e9d071da0dcfcf93066c1ebc1cd8c1463826153b41772bca73f15c4323
font_01_sfnt_off000109f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F2 17632 bytes
SHA-256: 2c56314659661778d6d87dfe2b2fc36286085f1a7da7a992b8b1ff133ef41993
font_02_sfnt_off000137d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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