Malicious PDF — malware analysis report

Static analysis result for SHA-256 32216faf8c70960b…

MALICIOUS

PDF

79.8 KB Created: 2021-09-14 13:58:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 83856dd5f07f4be4e90d0296cbe26c2d SHA-1: a27f51a02ae996ad5a49a9c55b7f9dbf114c6a3d SHA-256: 32216faf8c70960b56585b077808e3e313e2d4eca1267c23437c622dcb007b77
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a link farm pointing to compromised CMS uploads and disposable hosting. The ML classifier also strongly indicated maliciousness. The embedded URLs suggest the document's primary purpose is to redirect users to potentially harmful external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://elcolono.net/userfiles/files/76794210467.pdf In PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/tidenise.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/tozaviki.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613040eb835ac---rilemajomegogefi.pdfIn PDF document text
    • http://sdes.in/uploads/73822397187.pdfIn PDF document text
    • http://ledins.lv/cms/file/64969294098.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/titipezubujini.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210909083627.pdfIn PDF document text
    • http://mega.kz/media/upload/files/3900667665.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e78053a2e5---pububonemebade.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/cb35ce36e086ac06df37dd9f17152f9b/desixar.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/29316370877.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2c6a40bd2---14210865102.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/51259872322.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/rutowipodalibute.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/2b05418a15b756491ddc73640ffe715a/tiwiluniwesepotilovakem.pdfIn PDF document text
    • http://napiarsaigh.com/images/milofisijabu.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/kuvokarixelivirejutafa.pdfIn PDF document text
    • http://dallard.fr/ressource/site-image/files/xuropupamunoburajabona.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/xovadinexazijagopetituxe.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/92904626115.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/b6a763d6da2c1fbcfbba415216ebc164/28322844071.pdfIn PDF document text
    • https://indikino.com/ckfinder/userfiles/files/tifiloku.pdfIn PDF document text
    • http://nifaelectronics.com/userfiles/file/femiz.pdfIn PDF document text
    • http://damosushipleasanthill.com/uploads/files/nemudokojemo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+copy+images+to+sd+card+androidPDF 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_off0000d35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35C 17528 bytes
SHA-256: 76896eb245150965351b952488ac083f0b9113908ef9826e463fa917598f3f1b
font_01_sfnt_off00010027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10027 11004 bytes
SHA-256: c92cd82dcd4320ad87e6e67811cc1319d1b197ffb1545f1de9ec876b66dbad14
font_02_sfnt_off0001198c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1