Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f5fa942ed02bf45…

MALICIOUS

PDF

72.7 KB Created: 2021-09-14 10:19:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6f5c8aca0dc6c5e1c8ecfde5834e851c SHA-1: 63f87a52c1f1f0bcb014bd66ca81a989011d94b5 SHA-256: 4f5fa942ed02bf45ddb2f75b9dd5881bfb7c49dc9ab39d77fadc67be8cd43fc1
172 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and multiple links to compromised or disposable hosting sites suggests an attempt to trick users into downloading further malware. The document body, though obfuscated, contains elements that likely serve as a lure, possibly related to a fake download or a phishing scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://alkathirilaw.com/userfiles/files/pedovilobawigobi.pdf In PDF document text
    • http://joinsocialbubble.com/cake/beta/userfiles/file/nobowebile.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/1544971611.pdfIn PDF document text
    • http://odra.cycling-recycling.eu/imgturysta/files/limodogujifoki.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/maxidamifonolalazuguzubox.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613605966d261---suvidopujobus.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/pipiwividosezuxesabib.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/50187931695.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/gavudekovukomifim.pdfIn PDF document text
    • https://alternativi.brtim.com/uploads/wysiwyg/files/xowufavufewumukiked.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/wafalupomitesox.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613002f7c05ec---sulofi.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/bada668409b59e4055cb53c8e27b4786/xowadavoxoramojaxenub.pdfIn PDF document text
    • https://intersat.lv/files/file/jefomegu.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/64234811472.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/botofaxoji.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/wonozodupemivusixaganojus.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/48504038476.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/lejupi.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-12/20210912050028406020.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/9108493659.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613252605485a---wunokikuwafe.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/58936432335.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8a7d23dbc---70436597742.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/nukukuxavokivojes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=prelude+suite+1+bach+cello+pdfPDF 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_off0000b6c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ced2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED2 17524 bytes
SHA-256: 7e9d997ce633f45435aa258e8b17cb71ec6f1b774a5f6a6488b174915f96b045
font_02_sfnt_off0000fc2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2F 10904 bytes
SHA-256: 8184db83118e92599f9e1a526adda3f930a07abefa4969b697f90db1df2416cb

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