Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b99a43769d94835…

MALICIOUS

PDF

82.7 KB Created: 2021-09-03 09:56:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b78b3828406880499e30cad915a5b517 SHA-1: ee62328c23e83b2e13f0da31adfd370aff52088e SHA-256: 9b99a43769d948355c28f40c0897f69dbc3b825ab78a9a04375ee4f41de5dda9
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering malicious content. The PDF also contains numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=upper+body+gym+workout+pdf PDF link annotation
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e6328c273---97098209878.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/fexos.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9b4f99a1e---muximepari.pdfIn PDF document text
    • http://barnesfamilyconnection.com/clients/f/f3/f37d50667a1bb99e511e26172889fab9/File/suwunu.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/xonewotowezoramozos.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/popimatotosukafatal.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/35964017848.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/34928189634.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/76274341273.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/pujudewivekanotapexelofig.pdfIn PDF document text
    • http://greenbrier101.com/userimages/farumexagapumuwisanenuke.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/sekesatojodetevakasejame.pdfIn PDF document text
    • http://vogiantinhmach.com/media/ftp/file/89268773221.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160fb6ca3b435a---vusuzuxufof.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/85644508223.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/0bc4d284ff94353f4903baed1dd93f16/nerona.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/bbd0kihkkm84f2pr0i46e26ab3/43314567648.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210603153124410771rkssch.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/b5b120c80f5b5322e6eb87f22010cd77/rofasojanave.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/rewilikutaxij.pdfIn PDF document text
    • http://jar-ted.pl/file/jaroxojumalexewipotig.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/jukejatazokor.pdfIn PDF document text
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/9e61c3d7bcd3f9e370b91c02d21f2eae/donupafegofabavadabe.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c03fcb3892f---893436364.pdfIn PDF document text
    • 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_off0000e069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE069 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF880 10808 bytes
SHA-256: 21b58837f2e2c7272f73d6fe3e6b464c5fa0d3fba74c91dde0c4358334157e56
font_02_sfnt_off00011116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11116 17372 bytes
SHA-256: ec622c73c19968976162ee3d2f4ad5135cbc59e82cf8c84f2c0411db59ce2c88

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