Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2bfb86bd25fee3b…

MALICIOUS

PDF

72.7 KB Created: 2021-09-27 13:02:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7339d03033172d5cd05c5fbc8019b936 SHA-1: 558bdb6ad179d314333d97802c224c2121bca000 SHA-256: a2bfb86bd25fee3ba3bc8684c4af603a44edbf308cfc1ad92364f81744b007ec
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded JavaScript suggests an attempt to execute malicious code or redirect the user to a malicious site, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://pistant.ru/uplcv?utm_term=kotlin+webview+javascript PDF link annotation
    • http://e-restauracion.com/app/webroot/files/uploads/files/lefaloxixo.pdfIn PDF document text
    • http://sport-zavora.cz/data/file/99235180377.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/morutifa.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136029bb8c95---xogofe.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed83814a2c---9774382051.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/lubudovisimipazinagoxiri.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/vulewanegiwelegod.pdfIn PDF document text
    • http://deauville.ru/files/file/wasixotazujakovobi.pdfIn PDF document text
    • http://letdentalab.com/img/files/xofovipe.pdfIn PDF document text
    • http://fastcredit.ge/userfiles/file/83799270804.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c8d7220952---kavelefofovika.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/1aa91904a5cf8bf8f62180b478a5463e/50019147750.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/xojoxigem.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/161492d8f6a169---12886500345.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/65941392885.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/60646544956.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161462911de881---6919057057.pdfIn PDF document text
    • http://oookub.ru/upload/fckeditor/file/26315116136.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/aead83233632a1e75bf2f499c37c66fa/25587586911.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/73226557715.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/67705734027.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/83400503884.pdfIn PDF document text
    • https://2b3la571ga-70p.com/contents/files/33939052975.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/45789103478.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/xerid.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/lulabefu.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_off0000b7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D0 10780 bytes
SHA-256: 8d5765667d3ff68f3a26ba2fea8b408e8cf216d97a1eec2c327300bbf75f8215
font_01_sfnt_off0000d09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD09C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AE 17428 bytes
SHA-256: bf3d4a9f822e5e6425e3b7acab8bbefcb068cd0a7abb5c2fdffb1b0bf586df95

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