Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ebcd1e5d149bcf9…

MALICIOUS

PDF

82.6 KB Created: 2021-09-18 11:08:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1ef3765ad8abee1678524c54c5a0be07 SHA-1: 7e7419f2b8d7c059fd520183039e066e184b11ed SHA-256: 2ebcd1e5d149bcf92f0b8b2f02ec32472c441e4edfd496f0f76bf10611a4b34d
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links to compromised websites, suggesting it's designed to deliver a malicious payload. The presence of a visual download button further supports a phishing or social engineering attack. ClamAV detection and ML classification confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://hophungvietnam.com/app/webroot/uploads/files/kovevirufi.pdf In PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613bef9821215---18328720714.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16144a3d26021f---rasixizelopetejogim.pdfIn PDF document text
    • https://airshow-bg.com/file/vadawi.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/fapugijatuxinegefunusig.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/67616457867.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6f33b2006---sedanowefudazonexed.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/rukavuna.pdfIn PDF document text
    • http://kvrhousing.com/uploads/dadigebewoveboxalakefido.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/tudokovopimelixam.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/31810254681.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/vabedibokimedeg.pdfIn PDF document text
    • https://s-h.cc/uploads/files/202109061435508964.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/wikulurufuvavixarev.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/45091153038.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/7738829950.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/jarorezubegidi.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/89351017073.pdfIn PDF document text
    • https://ardiinerkh.mn/uploads/userfiles/files/bofatosiz.pdfIn PDF document text
    • https://negaratoto.com/contents/files/zelowilalove.pdfIn PDF document text
    • http://www.optimizecost.com/admin/ficheros_fckedit_subidos/43311790173.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/wumizurozim.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/mosaxifakaboluvoverim.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/wutedufizibonu.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/92441511294.pdfIn PDF document text
    • http://caytrong.vn/Images_upload/files/lanefezane.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=smule+karaoke+premium+apkPDF 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_off0000de86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f69d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69D 10308 bytes
SHA-256: 236c43cf4f7afa2c4f44b306d4b6cce581ba0e181595827e88beded728d13586
font_02_sfnt_off00010dcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCC 18116 bytes
SHA-256: c47944934f58c49d3a7a177ca78766574c99ae595532e12308346a1b734c2638

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