Malicious PDF — malware analysis report

Static analysis result for SHA-256 51e53f99c8bf8dc7…

MALICIOUS

PDF

68.7 KB Created: 2021-09-30 15:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f447582afcb3df9724021dea3994b7f2 SHA-1: 4e541e7bacdc62a5d4efc3ffae54f9cf7e2d9ba8 SHA-256: 51e53f99c8bf8dc7deea9976acf442f92df7ded19ce2dc127808917c4e2bd6bc
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It functions as a link farm, directing users to various websites, including those hosted on compromised WordPress installations. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://smidgel.ru/uplcv?utm_term=watch+my+hero+academia+dubbed+online
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/pugivefujumabitadojaromok.pdf
    • http://kangshi-you.com/uploads/files/202109221749599858.pdf
    • http://tlw.ro/UserFiles/file/85018445996.pdf
    • http://ecolservizinettuno.com/userfiles/files/vokari.pdf
    • https://dichvumoinoi.com/ckfinder/userfiles/files/21157673832.pdf
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/39007674491.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16137c26930c9d---zabal.pdf
    • http://bayanairag.com/uploads/userfiles/files/16361592649.pdf
    • https://elsa-daulte.com/ckfinder/userfiles/files/zinesarodewat.pdf
    • http://palyavalaszto.hu/teszt/upload/file/26522796271.pdf
    • http://fonnepal.org/userfiles/file/51004481522.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b7614afad4---gezirukikumugaruvu.pdf
    • https://kimcert.net/E/file/metitowobapezas.pdf
    • http://kondicionery-lubertsy.ru/upload_picture/file/87394946313.pdf
    • https://ihappywash.com/uploads/files/202109220953378842.pdf
    • http://decaiyun.com/upload/file/210906121706427962vamu6o64biyt.pdf
    • http://giasuminhtam.com/Images_upload/files/munoriwuxewe.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134c17fc7c9a---jopogimijazudasosomo.pdf
    • https://mediaskills.rs/files/dokexokujimozezebaxaragi.pdf
    • http://yucehukuk.com/resimler/files/76233992956.pdf
    • http://studiopassarotti.it/userfiles/files/87188379464.pdf
    • http://huefpdf.org/upload/file/topewupuje.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ad87.bin
07a9e109e025102b80b32a0e5dbfa31cfe23536b4305b87ac380d2f87b270d54		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD87 10816 bytes
font_01_sfnt_off0000c647.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC647 16792 bytes
font_02_sfnt_off0000de59.bin
eac0c367fab649ac48e1cca50999470340be37f7cc3ffe1327316ea6b107c274		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE59 15464 bytes

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