Malicious PDF — malware analysis report

Static analysis result for SHA-256 4850beb05d7478e3…

MALICIOUS

PDF

97.1 KB Created: 2021-09-07 14:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8df97896ecd586a9b0389d7166822134 SHA-1: 68c051ba54c4b2b726710b0e83e60b514886e502 SHA-256: 4850beb05d7478e34bdee33f16614c7137dc22ea387447d8c28c92552821afbe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. It contains numerous external URIs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is unreadable, but the heuristic findings strongly indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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://camgloberealtor.com/userfiles/file/buzoxaged.pdf In PDF document text
    • https://12tiga.com/contents//files/korokinivupurewutisefev.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095fb612146e---xisowugusufuvopukaw.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/51324722365.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/dr4a9ls6til3rnsrv7fjti7tj8/gezaredugalumikatusapetas.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a90d7773d1f---rilade.pdfIn PDF document text
    • https://atl-50.com/files/file/nojupolutasozamexudilufim.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4f54d2019---73197795892.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/9aff88027d7d16b7bd1482065d9f51df/69478299450.pdfIn PDF document text
    • https://granitnet.hu/editor_up/29949702148.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/56363244124.pdfIn PDF document text
    • https://kohphanganhotelandtour.com/userfiles/file/govirobazoboxuza.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/628fa9bcf1e39abf8a51377741687447/rakusuloxabulo.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4c8e27da0---wogux.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b82c5e149dc---faruvujapevak.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/71293191939.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/82058673032.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/281226535583.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/zixuvimibovumivet.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/merafisevawexasutaxi.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9e87ee244a---ropozen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=inteligencia+emocional+caracteristicas+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_off00011320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11320 10916 bytes
SHA-256: a351517496a51228d6eb849a7228af2a4ba187c4b9b0f2882d149be221d75de1
font_01_sfnt_off00012c27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C27 19696 bytes
SHA-256: 77714a043b8427c4bc75fb536bf575906607e57ec7be58a4dee485b8dd29d5d6
font_02_sfnt_off00015eb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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