Malicious PDF — malware analysis report

Static analysis result for SHA-256 87bfc89c6f00cd7a…

MALICIOUS

PDF

86.8 KB Created: 2021-07-19 09:42:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b1f0c48f9bcb40ab15d2c8e010d51206 SHA-1: 6f14065949aafc0ca2057f9151b132fbfc6c1ed0 SHA-256: 87bfc89c6f00cd7a02dfed1d4571299ab6315de4a59ad8210c9d07a6fedfbfab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://nutronicltd.com/userfiles/file/22527063201.pdf
    • http://morebricks.com/ckfinder/userfiles/files/tarofuxepet.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f034bf39c06---72937382025.pdf
    • http://www.kilincsweb.hu/fileok/file/80338969078.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/32e927b931a7f0277921cca8eb5837bb/41125128189.pdf
    • http://markasib.ru/ckfinder/userfiles/files/fejexubulapun.pdf
    • https://smallislandcurry.com/wp-content/plugins/super-forms/uploads/php/files/4f7fec954f032195abca0edc8c6c6848/xelinikujejunikipopotesi.pdf
    • http://idealhca.com/admin/images/file/51428769281.pdf
    • https://vegas-shop.net/uploads/files/fejufijus.pdf
    • http://hesexpo.com/img/editor/image/file/wamakozizorabifezopone.pdf
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/27168841514.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f4fe9a74861---gafax.pdf
    • http://vodnik48.ru/content/file/83538221855.pdf
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/luvirul.pdf
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1282b1f90---semukepisufetarepetiriv.pdf
    • http://ibtaker.ps/userfiles/file/30517457293.pdf
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/9d01c3447eb714beb4b1b336a78005f2/81856146996.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ca0f09df7d5---5330021168.pdf
    • https://decoveinvestment.com/userfiles/file/40174239859.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/575tfjsl9efqkvif0abbq0iq2j/goruxot.pdf
    • http://irishheritagesociety.net/clients/7/7f/7f3653e4c5d791bf76f28d2bf9929747/File/55754198358.pdf
    • http://sewakendragroup.com/userfiles/file/dajuzasixididifonewabedi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=people+getting+hypnotized
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efd2.bin
2c65bd89f8949a62cad90b7eaaac387f01ab181602f289988756a5bee1080e72
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD2 10416 bytes
font_01_sfnt_off0001071c.bin
69f9acb712f1d27989b7c2aca856bf832207dd2ef9e92d9ce0c3f5631c822ec5
pdf-font-stream PDF embedded font (sfnt) at offset 0x1071C 17536 bytes
font_02_sfnt_off000134b6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x134B6 16792 bytes