Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb50d8100af814d3…

MALICIOUS

PDF

68.2 KB Created: 2021-09-26 14:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1b877a42ec8490ca19c67a95774e662e SHA-1: 90c484d79ce9eb9eb3b93584628539f94c634b19 SHA-256: eb50d8100af814d34ecb17bee58ff96e8b1bd686767cecbe67481f7a644ba918
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are hosted on disposable or compromised hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using these links for malicious purposes, likely phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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=how+to+stream+the+harry+potter+movies PDF link annotation
    • http://suliaox.com/v15/Upload/file/2021924112166326.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/lofekekozaxakavudi.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/7905b182bc13ff486dd0fafb180c5ea3/powuduxidaxurip.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/duwizilogimozotazilepit.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/33380452090.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/japametixuz.pdfIn PDF document text
    • https://huaienclinic.com/uploadpic/files/51248010107.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/9201360026.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/57690464096.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210912_B7D2775DF2CCAB44.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/87356076355.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/67979959398.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/96699872070.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/wasodow.pdfIn PDF document text
    • http://suurelepa.ee/data/file/92775421729.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/begakop.pdfIn PDF document text
    • http://xhzhengli.com/upload/pizegumiralariduzolise.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/tutigutus.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/vekefefu.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f66bb77695---dobojevawamimotudef.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/xibeluxaxukefuzizifuvez.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/21444645829.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161408fc6b7dbc---sozezumowiworafatigo.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_off0000ad1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD1A 10624 bytes
SHA-256: f7ef38eb88c58d72d35ce0e6d8276096d3703f59157a4f9c582388cd3393e228
font_01_sfnt_off0000c581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC581 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dd93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD93 15116 bytes
SHA-256: 85bcf00b55ceeed0d8eeef8a75fbe477dba6520a8b2494694b550e4d49c1e5dc