Malicious PDF — malware analysis report

Static analysis result for SHA-256 26699b298d4e9034…

MALICIOUS

PDF

81.0 KB Created: 2021-09-17 07:09:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ee8bd4db1de591af59c1d558ab667fb8 SHA-1: 9ddb1019ef7feb092c2cf8e9de12dd900e4854f3 SHA-256: 26699b298d4e90346464e74a462e3b099bb5e666c77d421fbbc3990aba8c44a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and contains numerous external links. Several heuristics indicate that the PDF is a link farm, with many links pointing to potentially compromised or disposable hosting. The presence of external URIs and the overall structure suggest an attempt to lure users to malicious websites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://ketchas.ru/uplcv?utm_term=tell+tale+heart+pdf+original
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67737423511.pdf
    • http://retailcop.ca/files/mobiwo.pdf
    • http://castel.lu/userfiles/files/43278927246.pdf
    • http://studiodabo.eu/userfiles/files/sukutabemi.pdf
    • http://www.nagsa.es/ckfinder/userfiles/files/59152428252.pdf
    • http://ambartakip.net/belgeler/file/84905593547.pdf
    • http://rm-centr.ru/uploads/file/sifotefixif.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161396946301e3---lofepuwopamewep.pdf
    • https://duocvinhkim.com/userfiles/file/vojawalati.pdf
    • http://ieeepes-thailand.org/app/webroot/files/files/kexadavigip.pdf
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/budusozojusogoni.pdf
    • http://terremeraude.com/userfiles/file/23084037837.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/f0fc1fc41932ff2824275cf7a2c0a4bf/72132641197.pdf
    • https://snapstudios.ca/userfiles/file/kotaxeremumiravaw.pdf
    • https://firsatoyun.com/calisma2/files/uploads/76075839238.pdf
    • http://everest-c.ru/ckfinder/userfiles/files/25673002532.pdf
    • http://seritour.com/rsm/files/5596777598.pdf
    • http://xenangheli.vn/public/files/55824774754.pdf
    • https://chuyennhakienvangvn.net/upload/files/97778613730.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/9bfe045a284c7f0976359f310cf99b5e/61078326989.pdf
    • http://mt-filtration.com/uploaded/file/82861745261324735b89ec.pdf
    • http://greenworx.eu/images/uploads/files/10080740057.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_off0000daf0.bin
edc83c4ec32ba6b4d92dfd5dcd76b3569d385bfdd544ceccc2fa9474055cbc06		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF0 17192 bytes
font_01_sfnt_off000106d7.bin
36a1d30d691d69e71ed8e5b1b505f9c91046fed265b5a154d03912d468a5dc55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106D7 10572 bytes
font_02_sfnt_off00011ea6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA6 16792 bytes

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