Malicious PDF — malware analysis report

Static analysis result for SHA-256 d90cf955b3768fb9…

MALICIOUS

PDF

80.1 KB Created: 2021-09-14 05:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4545f9ef5f616a988ef3fe840eed51dc SHA-1: e95aee1b40984bf65211f81d5fd4cec2e2e3e732 SHA-256: d90cf955b3768fb99e8f9737ec0ca74b7b2da73389670dbaeb0d746d873aac0a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable hosting sites. The primary goal appears to be directing users to malicious content through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://nstyapi.com/resimler/files/59959261247.pdf In PDF document text
    • http://kahasat.cz/data/file/zafuwitufozekatilozixapu.pdfIn PDF document text
    • https://cebubigsellers.com/userfiles/file/30630613618.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613752931fdc6---nuviradivedisatipisaremi.pdfIn PDF document text
    • http://mega.kz/media/upload/files/taxusasuvodozufokifodo.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/31223566885.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/wizuridimavo.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/35333695437.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/68207734020.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/87565937153.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/22599955222.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/79126551930.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/0c1cc3cbd4b2ddce33b1b107d0dd10e4/72800517739.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/fadisafudewema.pdfIn PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/65417997506.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5fcf8b7d8---fujimirinepiparoj.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613415666dc1b---67077201466.pdfIn PDF document text
    • http://toflight.mobi/attachment/ckeditor/files/0d1e1e0f49bfe5f72f67b6616fd11156.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vowomodexobofevigiz.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/fikirolemu.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/30852294773.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/15292375831.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/zidozogijeboxekiwip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=does+facetime+work+on+androidPDF 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_off0000d5ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EC 17188 bytes
SHA-256: 3548dff9d518841f9bd27a516e4ea5876c2ff0b26094e7346d9311ac497e220f
font_01_sfnt_off00010200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10200 10768 bytes
SHA-256: 8adf1b593402a5ea9a31cd6ad8bf9115fc76816bd2cb5c2a2990043f628a2b09
font_02_sfnt_off00011ae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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