Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed98bbd8e65e394d…

MALICIOUS

PDF

71.4 KB Created: 2021-09-25 08:43:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 87f799987067a6d0c49339f2e8dfe407 SHA-1: b3ddb91f77b7ab776d070eb0bc9eeb61d4ac213f SHA-256: ed98bbd8e65e394da51a314f481a6987dfe0ffa4a2ab89aeba5f73cde4545552
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a deliberate attempt to create a network of links for malicious purposes. The embedded JavaScript likely facilitates the redirection to these malicious sites, contributing to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://krisoc.ru/uplcv?utm_term=credit+card+generator+with+location PDF link annotation
    • http://simkoongschool.com/uploads/editer/files/75516148225.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/vozefiwenetenakamira.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/lapoxipesetugugopenob.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1632125759_53959934c7.pdfIn PDF document text
    • https://whereestar.com/marinarubicon/admin/file/diwozulojijoboja.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/nafasa.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog/file/rivopobomutebu.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109131400081183.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/22845f85523cb71d2d677d036b2dea19/zonavu.pdfIn PDF document text
    • http://ltpbetel.ro/userfiles/file/kewasafebexifi.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130c12f1eab9---18090360942.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/41783069691.pdfIn PDF document text
    • http://myslizdrave.com/soubory/muzolopotilowesep.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/jatidebo.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/62a5c70f0c5dc161f86d53f41a58260c/wizidukamujaxabakojan.pdfIn PDF document text
    • http://dautuck.com/uploads/userfiles/file/jawezir.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/nekusewodadiwo.pdfIn PDF document text
    • http://fivelscope.net/fckimages/70861981673.pdfIn PDF document text
    • https://pcetravel.com/files/file/mugup.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/pagafuzisazelik.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/nuzevoxusiletinegekegu.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/67799319107.pdfIn PDF document text
    • http://syntra.pl/userfiles/file/20173035117.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/dabefalepulokerub.pdfIn PDF document text
    • https://jung-yeunjang.ch/userfiles/file/tajikagipemeged.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_off0000b19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB19C 17156 bytes
SHA-256: 533620f584f5dc93b4c6adf22f79eb8c23698c745d067e2e4dfcf07cd32876c2
font_01_sfnt_off0000de13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE13 10600 bytes
SHA-256: 2eb3229b5087c0f685715e08af9ada5e1c63042d893b4ac3e2cbab8ac7d084f3
font_02_sfnt_off0000f60f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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