Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4182c7711b73485…

MALICIOUS

PDF

83.6 KB Created: 2021-09-05 20:15:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5a3e9558da1cd60dee71042150417f60 SHA-1: 0234f3d4abbbb267884c81c46537a43fba896c87 SHA-256: c4182c7711b7348527efd234daa979bc8892c30bd78c71866781ff9ed0e168e3
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links to compromised WordPress sites, suggesting it's designed to lure users to malicious content. The presence of multiple distinct hosts and disposable hosting indicates a link farm used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://wastran.ru/uplcv?utm_term=frans%C4%B1zca+s%C3%B6zl%C3%BCk+indir+pdf PDF link annotation
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096b7c57c391---96120613439.pdfIn PDF document text
    • http://beytarimcilik.com/admin/editor_resim/file/36802287026.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/lvg7si3j3jq2cm30et7adduofs/wifutepufezanib.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf47b238ae---xotedebomumi.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/76860037025.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a105553b5c5---79715461172.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/b28a24972343e6f8ec121fa9fb4facb6/witutenizipajiru.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/segadidopodopitedol.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/37439fb09d9b6d1b70f242b5c0a69cfa/dabamonikuno.pdfIn PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/godigorizajakofa.pdfIn PDF document text
    • http://jkohut.pl/file/27677371658.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/xagasajupowowuwugogeguxer.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160aa513c0a0e9---77647854854.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/88390766171.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/75718992469.pdfIn PDF document text
    • http://ibb-online.ru/f/file/31960234200.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/varidetuvozebimezupulab.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/45669a67129fb05734d868ee7f600617/xofiwifupemariwegadimosox.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/97350912399.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/e37358c93fd06cffa6e841c0728fbbc3/bawajabis.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/pukuruxoralivoxinag.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC820 19144 bytes
SHA-256: 0f9fd0afb2d8059479cdd603d7a3fcb80f9798fe63c2c305bc1047f51903cbfb
font_01_sfnt_off0000f6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F02 10844 bytes
SHA-256: b057b649252016aed01c66167c62ff4a09d47bf8990cc64339a8eb7b5b973eeb
font_03_sfnt_off000127b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B5 16544 bytes
SHA-256: 66b7945b99a9c78025a9a0ace4161995b24b08b80ea391fd428eddc3553bac27

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