Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2114208221e05e8…

MALICIOUS

PDF

96.7 KB Created: 2021-07-01 20:50:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a49b9803f5a8fd00724a565c50e0653b SHA-1: a08ddbef56ace7307319d3e023a21d9664f6577c SHA-256: f2114208221e05e8d565aa828e141fcac0ee6393b9103d6fe7249d5f944e7752
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to host and distribute second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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 http://www.rotudavid.com/ckfinder/userfiles/files/xapazodujonovaxavajomis.pdf In PDF document text
    • http://nutricion-intravenosa.com/wp-content/plugins/super-forms/uploads/php/files/d3d37640f52b6ce38fa95c76d4d3c67e/redeginusam.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/721165a5bf73895baad946bf2c809623/vovitematinanudanifup.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c42e21d288f---72721411009.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/77230510416.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc725b00fb---18595050142.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/b47fb1cbcd1d4be8f45d4e18f6eca581/pelagamupezosuburilejida.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/1d1cb78c8cd3df6f5d620221d82f315b/83975061779.pdfIn PDF document text
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/52871238305.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/60464696124.pdfIn PDF document text
    • http://colescastle.com/clients/875019/File/maxuwupibowama.pdfIn PDF document text
    • https://airshow-bg.com/file/16023320555.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/99386120415.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864588c5011---3340123694.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/88946755816.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae48d6be11---mukosowuxifape.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/rugosavididalitutudidutaz.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/di9dpg364mpdpqqbso5snh1u4g/vuliwulaxu.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608599f622ceb---50996789706.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/dironodebubavi.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/04436cd36cf8375269c988f6b7d0519b/zuzofidazasipajalolexux.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/j5gi6f3c07d1sgsuovd1jf5v3i/rubudawukuxobakoke.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/48714991380.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/57065401670.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=soul+of+the+fire+pdf+free+downloadPDF 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_off00011670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11670 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012e87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E87 10688 bytes
SHA-256: 5b3c77cf53780166b3e7e09eae6f685b06352da769ddbbcf91304b0c936f2259
font_02_sfnt_off00014706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14706 18016 bytes
SHA-256: 6c30f6f6cc845ab830e4633840a72cdaea02ce4eb6248c6f85fedbd22eb8b716

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