Malicious PDF — malware analysis report

Static analysis result for SHA-256 362de8e6698d9432…

MALICIOUS

PDF

71.4 KB Created: 2021-09-29 07:33:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d02b42de4ba7a21c90421c4d33ae04ca SHA-1: 33febd325d337012eab848726ec5310fbcb540f7 SHA-256: 362de8e6698d9432b38b4f736693087c5a25d8278c433eb2b30b7c54f5e27040
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://studiosiciliani.eu/userfiles/files/papib.pdf In PDF document text
    • http://jpind.pl/userfiles/file/xuwevoke.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/e370ead269c05d4c692dcef0519baa32/xexojorerovapixorag.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/88984040487.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16138da22177bc---41374418312.pdfIn PDF document text
    • https://grandhotelushba.com/userfiles/file/pexesasuri.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/40131980617.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/87529138708.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/15940449848.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/57019187643.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/komesewenikonawo.pdfIn PDF document text
    • http://eko-gospodarstwo.eu/files/file/mozobiludikuletibuv.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/19969973713.pdfIn PDF document text
    • https://tigaintan.com/contents/files/33114465559.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/22877736234.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/7434244cddcf26f4c9ce94933bc21d05/pedagebogegipelam.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/texepopa.pdfIn PDF document text
    • http://atem.sciara.eu/public/upload/file/55857273351.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/xusijomijojisuninole.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/pekuzagokukawimozenefefos.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/depebodedevujisiripepi.pdfIn PDF document text
    • https://strefaokazji.pl/uploaded/file/62565544302.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/segim.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/63823581631.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=instagram+android+problemsPDF 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_off0000b400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB400 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC12 17512 bytes
SHA-256: 220e08383bb917c6477a9e41ad89bc0fb9c94e1f3a93f9276df68563335fe7b8
font_02_sfnt_off0000f776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF776 10824 bytes
SHA-256: 909375c94bf589459fa101eb80539fd8a252a5d4d254fca5ae730f50490f0bb2

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