Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d06570845854542…

MALICIOUS

PDF

83.5 KB Created: 2021-09-19 01:54:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0fa2da5354a56641ede2cedb54416a1d SHA-1: 41cdcbbabaf5b0d44cb02df06f8965ffe338f191 SHA-256: 8d06570845854542b423b7c823a9db77efab5e6dd4851935c6830b2d994ab1c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the 'link farm' heuristics strongly indicate a phishing or malware distribution attempt.

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://wastran.ru/uplcv?utm_term=supprimer+compte+google+sur+telephone+android PDF link annotation
    • http://gkz-crimea.ru/userfiles/file/4389885908.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/275917584.pdfIn PDF document text
    • https://2acontractor.it/images/file/zanodiv.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/30783574165.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613446f6bb372---95841929432.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/92741628967.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/tapilozumijasezisusaraxew.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/peruras.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a210e1909---funelusobonibagegikuniwa.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/rosakepeliserujajizexumes.pdfIn PDF document text
    • http://sourceandsecure.com/uploads/userfiles/file/88300587531.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16140b99e1b567---48116436112.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-5/20210905044502217708.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/2f70ea9a826c82f7323124913b1aae8e/tixafuvilevona.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/xezagedageru.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/47393148576.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/surudubuvebe.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa6ed1cb73---25826869258.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/4028915738.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/46262449067.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/23437801547.pdfIn PDF document text
    • https://lp-tracking.com/userfiles/file/luwikajefazakemegejil.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_off0000dd14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD14 19688 bytes
SHA-256: afd2e18726d2ef2fcc4f43e8e531ac66cb84952fa37c055db8ab3dabd7163644
font_01_sfnt_off00010e53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001266a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1266A 11136 bytes
SHA-256: 9f6426aa8c11bb58e453fdedeb2d0a4e94429e3992452c492b88263b3fa1f81f