Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e1e906d99c2a7af…

MALICIOUS

PDF

91.1 KB Created: 2021-09-04 06:18:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 48095e3ce67368b58e7b309a48d77289 SHA-1: eadd693a15c0aed89955a0bb39df0255bef7f73a SHA-256: 1e1e906d99c2a7af1efc914254e6140b70c4cf754410df9911c3b04e5b374016
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The file also exhibits characteristics of a link farm, with numerous external URIs pointing to compromised websites and disposable hosting. These indicators, combined with ClamAV detection and ML classification, strongly suggest a malicious intent, likely to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • 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://laborke.ru/uplcv?utm_term=s.d.a+hymnal+book+pdf PDF link annotation
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/raxubedegogikemisi.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/fazowilitunivulake.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f9a916118---sekonelinuzamuroloma.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/50981696477.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d65907453b0---68102326204.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/69485847839b2b6a26516b68404fd455/61798006425.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/82126880564.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b68ce44710---nokokirukemum.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/watozakepidopopezajidowi.pdfIn PDF document text
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/82542144898.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210528014955_612189060.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b72d0d22b34---dogigawanolotavemajirow.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1848d8762a---3781395958.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/85488867368.pdfIn PDF document text
    • http://maxbrio.kr/files/files/zafagejofijososunosotizo.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/zenatemeluremowejafazasif.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/4d3fe0933eb85af511903a3e625165cc/binapudop.pdfIn PDF document text
    • https://paradigma.bg/uf/file/10784446545.pdfIn PDF document text
    • http://skyrybupaslaugos.lt/uploads/files/96897078559.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/gkjachec6j7903iptien11gt84/48768782226.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/30382a85ac4175446270a9a5dcceddde/gilitududazewesuzego.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/38609343149.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/6221e0cd8c527ec624c6791d1a649a90/niwovixa.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_off0000fcb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000114c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C7 19104 bytes
SHA-256: 38cac4bd52457672d4f984a485e5f881f5883db391e341be07745b9518591387
font_02_sfnt_off00014743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14743 10660 bytes
SHA-256: d4c22114075d3adf4e8d89db8959ed2b2390b0c9f08fe6d1f31c020bbc1164b0

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