Malicious PDF — malware analysis report

Static analysis result for SHA-256 49dc8aaf34b5697d…

MALICIOUS

PDF

83.7 KB Created: 2021-09-19 15:28:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6ec8d9deca8d7500c053622685875bc3 SHA-1: f3a5ec29222b87b8749e89256f6d57f2823fcf9e SHA-256: 49dc8aaf34b5697dbf9ec79f1f060a8f0f5324f3afa59aeb32dbac1fa0c40090
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript and multiple external URIs, many of which point to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to deceive users into downloading further payloads or submitting sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://nomylo.ru/uplcv?utm_term=android+wake+up+application PDF link annotation
    • http://nextlab-semi.com/files/fckeditor/file/6322381955.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/nupotegobuwalomerova.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/74347914643.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/45099359784.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/48vuv3otmrch7nsfqup7eka330/7490711557.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131d85fd40dd---78272513361.pdfIn PDF document text
    • http://synergyproperty.com/images/files/90953101050.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/degimawuvafaferavu.pdfIn PDF document text
    • http://orderkai.com/uploads/files/80710197949.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/jexema.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341a4000899---manitofutave.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/zegijaniderolezumiki.pdfIn PDF document text
    • http://apismorava.eu/docs/webiratomi.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/wafesaro.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/161341adbf1a1b---vugodafejide.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/37058352822.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/43190005753.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/24250337568.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/80377584281.pdfIn PDF document text
    • http://ipublicity.cz/data/file/10240449142.pdfIn PDF document text
    • https://gameadvisers.com/js/new/fckeditor/userfiles/file/wefimojugomikowev.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/44972163604.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_off0000debe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D5 10596 bytes
SHA-256: 95fa0d1468f74a0eb3104c7dca57f7149e373a4089f9bfb489ea0ac0ab2d2252
font_02_sfnt_off00010f2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2E 18700 bytes
SHA-256: 93acbf18979a59cd2e52c01dc12ac73a5fd3c9a3916b58f13298ea93f3c3475d

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