Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbae43fb25f13c0d…

MALICIOUS

PDF

83.0 KB Created: 2021-09-08 23:20:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fe93131b1e5b34a1737c17f0ce5dd5a0 SHA-1: 64b473c859676b90a53e62dddee24812bc0e3485 SHA-256: bbae43fb25f13c0d8abede18ff85fb79ed716d595b9191c1ef24ce8b39f3d17e
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to potentially compromised websites or disposable hosting. These links are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://confeccionesruiz.cl/UserFiles/File/49914142589.pdf In PDF document text
    • https://beldapin.com/calisma2/files/uploads/20088166798.pdfIn PDF document text
    • http://adbrf.com/files/fckeditor/file/13825689961354bd9b3232.pdfIn PDF document text
    • http://samtekelektrik.com/files/52701972991.pdfIn PDF document text
    • http://nut-shell.net/upload/files/guxunuxupoxemidamolalirux.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133481997b8c---fukofovi.pdfIn PDF document text
    • https://noithathoaphat11.com/upload/files/tedutamesugosubo.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/ripiz.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137cf7191a4f---61057384042.pdfIn PDF document text
    • https://recrut.com/files/files/kopovosepizanivuxasizoluf.pdfIn PDF document text
    • https://jagominum.com/contents/files/fidirikozuwedakebo.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/46745910389.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/wipavadasisavuxizixe.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130e03c1d6cc---10930604607.pdfIn PDF document text
    • http://195exim.com/datas/files/50847753647.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/ciija5841c3affgtqohsa1ahlr/jeror.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/bodipidanemi.pdfIn PDF document text
    • http://farmina.ru/uploads/files/95818060624.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/25750346252.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/67437592552.pdfIn PDF document text
    • https://khonggiansangtao.com/platformecom/img/upload/file/tuguzajinunepi.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/nedarebabudaniwukotoxib.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/83062204659.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/sekefutibaxozimok.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/fakuwoxiwowogubesobubu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=gervonta+davis+fight+stream+freePDF 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_off0000dacc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E3 10860 bytes
SHA-256: 19bed28b56f81825532975dfde881bbfea74003f556869f7644e646d7d944c0f
font_02_sfnt_off00010ba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA2 19820 bytes
SHA-256: f15439a58ec6df86581566cd465abef30bb600ad0fcb60bb6227b7669bb57619