Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a04d24cbb9b3c40…

MALICIOUS

PDF

72.0 KB Created: 2021-09-16 17:46:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 21ca07842946c228bf0991c9ecdfe559 SHA-1: 40c62576c4d0355c0c8bf5b45e7657bf2f6d3535 SHA-256: 9a04d24cbb9b3c40833e365dcf606665efbd8e661bdf37fc6d2b46f44e3df9e1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple domains, some of which appear to be compromised upload storage, suggesting an attempt to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • 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://yucehukuk.com/resimler/files/99178793360.pdf In PDF document text
    • http://kant21.com/userData/board/file/vapuvadagopajelan.pdfIn PDF document text
    • http://elektromig.pl/userfiles/file/83108639500.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/64525139751.pdfIn PDF document text
    • http://ormansagszive.hu/upload/file/82718597989.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/navadikazoj.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/59754277427.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46690971567.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/vumozupaxepotune.pdfIn PDF document text
    • http://luyenthidhcanhsat.com/Images_upload/files/28916253873.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161396eab26e4e---76660553809.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136eebdf02b7---1569979727.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/relavumo.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/48379902699.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/kegakopuzotukive.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/69434619539.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16141fa1d8524f---14388680443.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/mikesi.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/48331135608.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/68692236872.pdfIn PDF document text
    • https://narellesastro.com/userfiles/files/52945508621.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109131747074179.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=love+rosie+watch+onlinePDF 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_off0000b95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB95B 10436 bytes
SHA-256: 6e4d0648a8ff97555fd0be4dc7e5592b27e8805dc2a9a58c29392681a3314b5d
font_01_sfnt_off0000d10d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD10D 16256 bytes
SHA-256: 4d3807e16df68c77a518e94532c64722430f264c6e49c5b8a893e0ba4e3a8457
font_02_sfnt_off0000fabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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