Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b4f4de8ea1d1883…

MALICIOUS

PDF

75.3 KB Created: 2021-06-11 08:02:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d4edd7af803df24df601e61379c43648 SHA-1: eb2640bd39eebfb2647ba039b67ec9cedde9022c SHA-256: 8b4f4de8ea1d1883fc8e1bd6095603af9bb4e6a1f4b75a23998e1ea6985329cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The embedded URLs and the document's structure strongly suggest a phishing or scam campaign, likely using a lure related to 'modern warfare' to entice clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://coretry.ru/uplcv?utm_term=how+to+equip+combat+knife+modern+warfare PDF link annotation
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/kjd761jjnc9nto0668amnqt6n4/zuvimubepujovegaketep.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/79af3a1a1eaeeb401d8c50e5d1657ff8/lizemijitugunufa.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/2013957273.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765b6ca663c---79564114125.pdfIn PDF document text
    • http://93564497.com/userfiles/10834001741.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/96722409426.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/inqbirks6c7vb5f2i03fss12j5/wolijufadutusukagamujem.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b39837930b8---95338036928.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/54083432288.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/1078e82c36d6043901e6e43096c9feac/javefe.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/2589568753.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/48340216615.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/tepumazutav.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/veredegawukuvosumidomepe.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/q56nrhl85cqmj1aedpk3qb6gt1/bonupiwipibowejos.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/37996496624.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D1 5472 bytes
SHA-256: da68374536c877261ce9097b115418c4e67df1b2f8c3d42e950a8d96417a0b13
font_01_sfnt_off0000fa6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6B 11012 bytes
SHA-256: 2b3349e0c3a2811093de9574888d54264b4d2024db45eadf1f326f12414aa5ea

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