Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cd78b8ed9204778…

MALICIOUS

PDF

95.0 KB Created: 2021-07-28 03:38:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1b1b0eb4385b3557bfe1700ee744fbf4 SHA-1: a5e5501e7d85d210992f7deae3250fc6a8dde5dd SHA-256: 2cd78b8ed9204778a4a54f7a6e545ae1f1e53a2d4fd9362630760b13dea5d792
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier strongly indicated maliciousness, and the link farm structure suggests an attempt to redirect users to potentially malicious content or phishing sites. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 5

  • 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.
  • 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://mtecommerce.it/public/news/file/ribanefulagogatunoke.pdf In PDF document text
    • https://aquafilling.com/userfiles/file/75359450805.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/ai6qf7ridbnrj5evq7qsq69jq6/gakew.pdfIn PDF document text
    • http://limoride.net/gallery/file/bujaboxukixilojopoluvug.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/1151dfa680eb381110539069241c9d09/20178804790.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/41hhp3f2m5745ei8mpli6gce5v/17668640062.pdfIn PDF document text
    • http://beiks.info/public/file/zitamexazijirigabe.pdfIn PDF document text
    • http://championsview.net/userimages/32471990450.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082450aafeea---guzog.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c91c89bb18e---jalugexotirizakavidezozaj.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__60ECA78D1D420.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/12e26ff2de2734dbd3c7fb9309610acc/xezaxi.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4e8f66e99---48317134764.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160740aa4d461f---tutuvaromuxumoletepesi.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/91963028875.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/59412068276.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57227741990.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/16acebdeb8ed87cabc5a1f5b0543de76/dawofujogoruravarutopo.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/bb79331e51580deafc651e169b729d04/kesakaputo.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///fijafu.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/rerasasakadefigut.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/a625c62639fa04d9083f7291e8aeab8e/ligem.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/51949530287.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=rawls+liberalismo+politico+resumenPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/6c81f68c3b2b5330d4bcfe42e742018c/vediraxe.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_off00010fcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCF 10908 bytes
SHA-256: cb3caf5d17ba54ef92d48e3a22cb0e112f946755708f66da11fb051a0d364ccc
font_01_sfnt_off000128e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E6 17544 bytes
SHA-256: 855bf9f7939708dd750712a2c030e2c657bda0773ab229bc58e9a1304e4adaac
font_02_sfnt_off00015586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15586 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1