Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a2308235d664817…

MALICIOUS

PDF

80.3 KB Created: 2021-09-18 10:11:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 41b52439c7cfc227275cb190ef45c60b SHA-1: 37ce5f8497f715661f21bb801f4e1162d8787e47 SHA-256: 9a2308235d664817e6ac8e8807cae96405c2ec2191187a14efcee9f051b1e1f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious document designed to lure users to further compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://panelshock.com/userfiles/file/lirolimofuve.pdf In PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/ralelorixikikotibomireto.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///99897845323.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613517a82c088---nexinilerimusijelozolem.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/10153608684.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/jivekene.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/28368712873.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/41322049455.pdfIn PDF document text
    • http://humanlitech.com/files/files/norag.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/20658039809.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/buradatavamadirasoxulok.pdfIn PDF document text
    • https://tomas-music.com/contents/files/6549099741.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b892d53ae---72613673583.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/29356544584.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/19477100976.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/tazusubozupitus.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c93e004a8---vipivatiga.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/sevalek.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613315d600ab9---vorifulare.pdfIn PDF document text
    • https://mediaskills.rs/files/gawikotazupadovilogi.pdfIn PDF document text
    • https://moolans.com/uploads/files/xexumukad.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/xigizolupumex.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/bifofiri.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134aaaee7cf5---piluwukixudukirunan.pdfIn PDF document text
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/wozatanixabedarevubokuv.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/zelivogin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=nmap+android+terminalPDF 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_off0000d462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD462 17956 bytes
SHA-256: 382d99d552088e3784b5138e58d87d07c946c3d76d9c6373fb78f04ba807b1ae
font_01_sfnt_off000103a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A2 10364 bytes
SHA-256: 45dd598e0d290cce562b1603fd3ec3ecc8e44d5243ef6e908416b0f88088fed6
font_02_sfnt_off00011aeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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