Malicious PDF — malware analysis report

Static analysis result for SHA-256 c55e2dffd18e293b…

MALICIOUS

PDF

70.2 KB Created: 2021-09-28 05:05:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 88109ec02fb94ecf972d2f370bee3708 SHA-1: 583ae8bbea8b38a5ff7b870051d5d45cf94d8e68 SHA-256: c55e2dffd18e293b32ee5b3cab7d8cc7b71c02a4e14bfdaefe6fc1e40df5edd3
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs that point to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests a phishing or SEO poisoning attack, aiming to lure victims to malicious sites.

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 http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/46593049295.pdf In PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/9401909728695ad251ba3a7296741800/fafiziputukodowafumar.pdfIn PDF document text
    • https://udruga-invalida.hr/files/57903149040.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/labumodelunejunisemiwevup.pdfIn PDF document text
    • http://jawarakreasi.com/file/64258397893.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/dotevilodadofuf.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/mejepuzapipoluvaw.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/80515137039.pdfIn PDF document text
    • https://equalland.com/uploads/File/4909045657.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/38279438837.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/52846740229.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/ravapipor.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137930aaf277---libabo.pdfIn PDF document text
    • http://caytrong.vn/Images_upload/files/64944965510.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/ponc7brmne0ietqv5eavdkl0n2/zidabozopowukoviwom.pdfIn PDF document text
    • http://erex.hu/upload/file/28783973960.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/95522507918.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/pejupe.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613c94a7d4232---bozabasuwow.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f0f36c2e33---80119912474.pdfIn PDF document text
    • http://shiny-baby.com/fileimage/file/74393651736.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161334763bbdef---111738049.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=fire+red+emulator+downloadPDF 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_off0000b200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB200 10404 bytes
SHA-256: a05f4aa91b7f5d1198120ade10e0b14902bdc664a4b8416498d8f01d7e3b01d4
font_01_sfnt_off0000c98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98E 16448 bytes
SHA-256: a744da0ac47be6566ecda40fd31c23f9fef3c49d94e93edb8a9497da31584fbf
font_02_sfnt_off0000f350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF350 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1