Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1fb6243f8e0d5cf…

MALICIOUS

PDF

100.1 KB Created: 2021-09-06 08:24:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8eaeb5a6f6fe34873d43069eabcdec1c SHA-1: fee49bbb17d9fa560f189c0f4b150897f4165db8 SHA-256: e1fb6243f8e0d5cf466cfa453d5e5b991b6854a55a6383eaeee1d6e3eff7fe47
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and link farm indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160835c3b56c4a---72089372710.pdf In PDF document text
    • http://humanitool.ru/userfiles/file/lixolobomis.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/jiwuwufuxowi.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607acec519610---67411547812.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f21c7407c9---nudogojeluwebuzorod.pdfIn PDF document text
    • http://plncse.hu/php_data/file/fobolikuxazavaxedimaze.pdfIn PDF document text
    • http://lalinpress.com/ckfinder/userfiles/files/19454692952.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/50fd799a1fd814809116cfdaf1f3a52c/20591729616.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/63914639029.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/32555016186.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/47063950437.pdfIn PDF document text
    • http://elai.kz/upload/2021/08files/210818165147449233vbxmv.pdfIn PDF document text
    • http://voijin.com/userfiles/files/93090810796.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/39968028071.pdfIn PDF document text
    • http://beateromer.com/bilder/file/nipetusekamuluzigu.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160d3f58ec04c6---morome.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/32806796783.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/dd071c885b7ab07705140f9b4d5053c6/durukamemegitofujep.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/2t015g039aseo16cfm01pdgsam/38362760147.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/30113140543.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/94889250955.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=magic+flute+libretto+english+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_off00011bea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BEA 19684 bytes
SHA-256: 49e8ee9c23ccf0abe19102144f15961a8907c634caab30cf7139856b92899ed3
font_01_sfnt_off00014ed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ED7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000166ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166EE 11132 bytes
SHA-256: 35a298dc62bd292dc841ead6d5f99394050a96a6eee449ba7ed09ef5711de6fd