Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ebfa697514cca97…

MALICIOUS

PDF

83.6 KB Created: 2021-09-07 03:58:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9559639f2b0080a6a5def8c8b7d2a7df SHA-1: bb60948990b45453602ab8d402a7dec91a8520da SHA-256: 1ebfa697514cca97b5950bc061038ccd96ebd29610fbcd2f9c29e1479087e97a
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains or compromised CMS uploads. The 'SE_INVOICE_LURE' heuristic indicates the document's content is designed to trick the user into clicking these links, likely to download a secondary payload. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://krisoc.ru/uplcv?utm_term=discounted+cash+flow+techniques+of+capital+budgeting+pdf PDF link annotation
    • http://lnyy.cc/uploads/file/1630421579.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/penesesajilekevifovud.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/vodosuzazeji.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16085a3ea150b9---kixos.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6018a4f85c---33559968585.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f303d50c3---34122254418.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/satufowezuwu.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/89429065933.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/xulareke.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16090b905945f6---ditutesa.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0a8cd32cab---58430819671.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090540f59987---paxaderunonupomelig.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/99722427191.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a50abce368b---61620569169.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/sidonefotirepel.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/36479991286.pdfIn PDF document text
    • http://pleasanthillpchurch.com/clients/5/55/55aa087cacc886b2254ddcc242c0699b/File/1202304640.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160911f42173dc---41795148991.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/gamorokopozupez.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/puzuzidupuf.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd7d88f5bf---kidusof.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_off0000e269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE269 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA80 11272 bytes
SHA-256: 3ccda76c49a02c12d34dc0d66194815dcff1b7409d1b70afa8a18feae428537d
font_02_sfnt_off00011435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11435 17024 bytes
SHA-256: c28228452483012cd2336a340a3f0b7f3d86e80eaf8658db4e442180ad900b95

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