Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb4bca8e950300bb…

MALICIOUS

PDF

97.6 KB Created: 2021-07-17 14:24:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3575962cd254274ae7adea82c1e8dce6 SHA-1: 8f101e69b756d8e229c8ade9a78f42b022da2528 SHA-256: fb4bca8e950300bb9788ecadbcb4ac7bb1364de5f3910ddec7bd529afc74ed20
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate maliciousness. The primary attack pattern appears to be a link farm designed to direct users to potentially malicious content hosted on compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9710

Heuristics 6

  • 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.
  • 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://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/ebbea0041191dc2b09b08c504233dae0/262998698.pdf In PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/gijupinigivo.pdfIn PDF document text
    • https://rumahbaruku.com/contents//files/xunazik.pdfIn PDF document text
    • http://jhroseclassof77.com/clients/45984/File/newubamirepajerapabuxuz.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096df4b0068f---sidusuwisozolululojizotaf.pdfIn PDF document text
    • https://mfdesign.hu/files/file/xirexafanujazesiwujuz.pdfIn PDF document text
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/95fc2b1cb136c49951e65b3237c5ecbb/xodulujatuvoroleduf.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/modavigaku.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/xajur.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/5420013901.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607065afb6eec---21869592621.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/madunuzisalasojita.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/wejidubuwi.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/umskno5ge8vgg52bv1v34b9s61/9944335509.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084fbced5aee---luwesanupagavuxifegetikok.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/wokogovuzakefegaduderok.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3807903679f83547bf2ffb962aea6466/24336359892.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/14951489244.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/570s98ifm59n2eo5rcj3ovnot1/jilobaketan.pdfIn PDF document text
    • http://www.puhito.hu/uploads/24904761900.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/11fc73aab1961c4429fcc43614e62be5/pomawegix.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/31165535162.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/81338257554.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ecab6b912---61285320387.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/82771593649.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/wodamurugabuxanijixi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=yellowtail+cribo+for+salePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11208 18404 bytes
SHA-256: 723e9940a8e7f4d54313a1b13203a80c0fa9638a77d2d70dfdcfc918fc07b105
font_01_sfnt_off000140f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140F5 1676 bytes
SHA-256: d03db559901a3ecff2bbd1a29d1ed226e24ce3a283915f7823ab8873681e7b6f
font_02_sfnt_off000148ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00016104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16104 10432 bytes
SHA-256: 5a0218d54286d628db4ccda71004f600519a6f8d791b31892e129149ab2663e7