Malicious PDF — malware analysis report

Static analysis result for SHA-256 2381fb5514a6046e…

MALICIOUS

PDF

91.1 KB Created: 2021-08-15 04:48:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f82f52361ec1e9dffa45e95e58149719 SHA-1: c92448a8659083f7be372cb9b6889445516c5167 SHA-256: 2381fb5514a6046e21eabba9661292e767e811a6659896ec5c76e3ba3e35f32f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload storage, suggesting a link farm designed to distribute further malicious content. The presence of external URIs and the nature of the link farm heuristic strongly suggest this document is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc5b25783c---mizotijewobumisuwamis.pdf In PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/7852461310.pdfIn PDF document text
    • https://mtmhomeschool4art.com/mycms/uploadedimages/editorUploadedImages/file/fimunenewijupotifago.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081c3e2d776f---vofuruluva.pdfIn PDF document text
    • http://brownewingfamily.com/clients/a/a4/a4d7a48ed280e719b438ae57db99af5e/File/kolazijunimerudif.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b92df2699---37230556269.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767d5bd29b8---28934020661.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609f898c8f8a1---labizuxab.pdfIn PDF document text
    • http://wajl.net/img/file/202162511444.pdfIn PDF document text
    • http://donghocasiochinhhang.net/uploads/userfiles/file/61413455314.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/3d0ceae3469e39f43a3f4f110b04cbad/livuvo.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/99764933491.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/accf475ab6b71d5228a08f4b85f7bd65/lulexedezarexuve.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/tasazosimodezori.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/8bp90n13v2ea6904uh2ivu6daq/pikitivukolusufuwi.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095466c9c9b2---dowomenajikujemum.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/zugorudanuvo.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/f1joki7e5escpt9o82kmtrvb13/34442134390.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/mnkrmcgi4pv35pvjhgbaifjsm4/nokaza.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/83462090223.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/45445940043.pdfIn PDF document text
    • http://lucann.com/Upload/file/felefaraliligidoneguvan.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/02714996dc84e3fa599df2af9a47e35e/60239694945.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/vuposizil.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/73353773998.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/49513611962.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/430dab7f5d46d052ccc9ed7b07bd82f7/50696122085.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=descargar+abbyy+finereader+15+full+espa%C3%B1ol+gratis+con+crackPDF 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_off0000f5ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EA 18880 bytes
SHA-256: 39c7c162d381fa19f9c0acdc880b35d1ea51d1b1373ecedb8447e4d037d55189
font_01_sfnt_off000126f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F6 11636 bytes
SHA-256: 4d60391a021c77bd6d1776032f629e38836d6bc0b13043477ccd3f80324864a8
font_02_sfnt_off00014245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14245 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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