Malicious PDF — malware analysis report

Static analysis result for SHA-256 712ea7e969f16fe5…

MALICIOUS

PDF

84.9 KB Created: 2021-07-26 16:47:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b3d4614d28f8172cfdba6db45ba5ffda SHA-1: d87aae2f13cb90f8736e6458c3d70e20ca06481d SHA-256: 712ea7e969f16fe5ba6b8a543b16b8081ee67f51320df2d882bedd81e53ae025
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 compromised WordPress sites, suggesting an attempt to lure users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/9clvjr788id7309dvdlncrb4a3/zuwexotefada.pdf In PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/55053563925.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/lajavubakesuni.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/33840928907.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/b74690ed1572768b84ccf88394f6d31d/33165192749.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/25459046169.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160822286d1545---80469312011.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16087fca047dd0---17135288259.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/gulilizuravox.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/ga90d11vmdcf4cgsd3h86e38v1/20624356928.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/64581665519.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20215151646418578.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/jujosa.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/repofu.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/eaedc7646c36ab189c8ecd1a8a042f72/vetojuvuwurovazamesimig.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/64711004262.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/18759cfad6ce5647f48899d550bcfe11/dawilesotum.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/taxupepolidanajotaga.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/wefurabuxu.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160daf9c93c135---18409640882.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/e2sjnk80f6s6iofdvoc866str0/29819768104.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/23584592360.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a58e36e302---vafezixugalupepij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=antologia+de+mitos+y+leyendas+griegas+pdfPDF 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_off0000e4c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C3 10936 bytes
SHA-256: ae32c0f2e210ec1124a9cd919ef66d483c7d9bcd4632e0af12a7776f7a8c285e
font_01_sfnt_off0000fdf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11606 18000 bytes
SHA-256: dde000149d397a0839ec80ba859c05a62b83043439318b23f097655e969b0260

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