Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1c14eec7c22053e…

MALICIOUS

PDF

84.2 KB Created: 2021-09-01 05:06:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: c011578daf576a62f0f7008e04ab1658 SHA-1: f5a43989062680f6d71fa499a3b996bca6d08f08 SHA-256: f1c14eec7c22053e1ac991ff0fc0d73b3f3a0903310e8eb85a0f1fdefcbf223b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 https://coretry.ru/uplcv?utm_term=shared+excel+file+not+saving+changes PDF link annotation
    • https://ltssinternational.com/res/wysiwyg/file/71431765944.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/kepazo.pdfIn PDF document text
    • http://heizler.hu/files/file/93328623719.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/c5df576c2221b9c6223fed8ec8ef0b70/wamoxafexugivivapekinis.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/19422395978.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/semuvividalewuseb.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5cc89ab1ff---nuwobuxefeguvawiw.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9ee586f68---16246300747.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/masojupazenepulugexan.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/sasifaminukofaz.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/fuwekokiw.pdfIn PDF document text
    • http://wwstationery.com/files/file/64458614263.pdfIn PDF document text
    • http://unitekinfostructures.com/userfiles/file/lovab.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5e693d394---9766529289.pdfIn PDF document text
    • http://c-amc.com/upload/files/rapolijisazamaxofokokibu.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/wajotuxazorujemeb.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/kufokaneke.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/8729c5341d3b68388f0c8b539b450938/zuzalobuferupomalopodaba.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2d9dc9f57a---44948143504.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160790dfae700e---72755551209.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/18855140849.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/makamakaxovezo.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_off0000e27e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27E 10996 bytes
SHA-256: 0fa4e900e28c2bdad4d498ac237223425a97b0653491b86430a8b37fc2804c3e
font_01_sfnt_off0000fbd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E2 17612 bytes
SHA-256: a866fa8c68d3cb1d2db05ef046da85943a019b65373dca8d0249f055d2dfe52e

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