Malicious PDF — malware analysis report

Static analysis result for SHA-256 868614d31de0d64a…

MALICIOUS

PDF

74.6 KB Created: 2021-09-18 14:59:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 61ad4d147e953e61e3fe6ca9f9ea8969 SHA-1: c2ecd5254b1b12e4f772d7978bd5a60c3ec3b3a0 SHA-256: 868614d31de0d64aab5cb1cd94e2e821df96dffcbf8e55926844ed4ce6d3b8c7
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, indicating an attempt to execute malicious code. Several heuristics point to the document being part of a link farm hosted on compromised websites, likely designed to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is used for malicious redirection or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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://milsagliksen.org/upload/ckfinder/files/sopikojalivu.pdf In PDF document text
    • https://georeno.ca/userfiles/files/lukubidokizemimoduvu.pdfIn PDF document text
    • http://wieswioska.pl/userfiles/file/78098167731.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/cf8f7239ba00362dc95a8246e99d22d2/22217129683.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/fexejen.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/jededazaxa.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/wubugubusezideguzifa.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/radiwi.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/vefajewilikaxoxikomuzam.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/9c07d67544babbf1c3c75ccf641156a8/25887984064.pdfIn PDF document text
    • https://mrpressconsulting.com/UserFiles/file/4975950147.pdfIn PDF document text
    • https://landi-bg.com/images/file/30688982741.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/3abc820abed9e132817c50ed57f5628f/gofimogixipolumabuwokisur.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/91820291850.pdfIn PDF document text
    • https://edouardweil.com/userfiles/file/vukikurutidageluwoxoja.pdfIn PDF document text
    • http://lejuriste.ru/files/file/97736273408.pdfIn PDF document text
    • http://houselandia.ru/files/18334710025.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383b0b824c0---nozasujelunarewajofofa.pdfIn PDF document text
    • http://it-hair.com/userfiles/80999323783.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/48162063697.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/18690298008.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/79929324898.pdfIn PDF document text
    • https://electroagro.es/pub/files/dokapelewofoginurizo.pdfIn PDF document text
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/51710408426.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/tuwubewiwise.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=linux+administration+a+beginner%27s+guide+pdfPDF 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_off0000c18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC18D 15940 bytes
SHA-256: 35dd732d5c72c3a3d9258a2c162b0309b1d0b7ff7057f3375ecf75d51595421a
font_01_sfnt_off0000eaa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B7 11128 bytes
SHA-256: d778ee70f39ded6d7b3a8266cc2c0a73e5161ac465a832a6f7e117d8071ea530