Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbaa81980c5f1ec6…

MALICIOUS

PDF

73.5 KB Created: 2021-06-24 07:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 3cf6739c9504ecbc3940d1bbdc2b9321 SHA-1: 23e9a39240d24604a2fa6bfe58ea824d63047be9 SHA-256: bbaa81980c5f1ec69e3739d84492fd306dbffd20e5bc24ae85e3d09aac973176
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories, presents a deceptive download button and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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 https://queure.ru/uplcv?utm_term=ntse+exam+model+question+paper PDF link annotation
    • https://permargi.com/files/galeria/files/20422132408.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/kimoremomuxu.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/322745b611703349f899b241733996db/80101873668.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/3b370351a52202f371403c6c4ccf0f85/balarujodozutemolake.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/b18fd60125afbf0c63cff1324897e46a/68761198770.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160af9dc0cbd6b---6535984265.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721c3843932---70094817746.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/tegufokine.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/tejitejunewubutufapafitej.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/0dc8a42ba2c2aec986dc8a132e00666e/58955621881.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8145322953---57024871928.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/0aa98d9b8b72e17d443e2bfc703bb072/44920400755.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/63300356493.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/ovomgdr15k2bfsu9k0bfhu4ov7/saziwivisiwod.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/99269341455.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD713 5268 bytes
SHA-256: 2bb153546c36e3551aae084ad290f8ea295cc8ba5b5709f520a26ea8a8c727dd
font_01_sfnt_off0000e8ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EA 10512 bytes
SHA-256: 18b4b3f155d59d6ac7c1b1da7db988b134f46d270042531d2b733a72ebee492f
font_02_sfnt_off00010cff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFF 2976 bytes
SHA-256: ea2bd2ff1d1a8bbd27b7736bd1b9b8db67274d6e221628ebaa3efe0260fef7e2

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