Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cde4934bb9e1b36…

MALICIOUS

PDF

85.0 KB Created: 2021-08-15 23:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: caacc2dd5c876cf87786200be14d7a61 SHA-1: a23ee66f53635549c4f8b95bc3a801c47e5c29ec SHA-256: 5cde4934bb9e1b36181fe90e8a9e039b73270be4515fa32d02d74f051780169a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs on compromised websites, likely to lure victims into downloading further malicious content. The presence of external URIs and links to compromised CMS uploads suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://medvor.ru/uplcv?utm_term=proyeccion+cilindrica+ortogonal+dibujo+tecnico PDF link annotation
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/08959a2c22658c0db4deb2675d6cfb73/tofinesipewuzudotiped.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/sidukopofunisux.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/67197829603.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/236e7d0c04bfc6f3e467a276b19bdb53/21875875883.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/78012987024.pdfIn PDF document text
    • https://activepymes.com/pub/file/folelulemilenopet.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e698f1db03---56263404382.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/dowisukapiludejikep.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070a8f070c8c---39449429334.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f50aa6b851---labawezevigusiwal.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/86646193486.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/9u6tg9fapu1af8olnl7t3ovcns/ragadobulojozenusodixu.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/u3laikg4d6moe8bojc7ghlppm7/lujuta.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/dowoxabedejopezom.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e23d315bd5d---46389491267.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/9fg0vmmhjd9bke57n7t6mkd6r5/42026272706.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160fb0b202a3f1---razenananafojinuvawapego.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/zagife.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/98p9sbgarcq3a70dp9i33426os/tezani.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca75fe3c98---49233307833.pdfIn PDF document text
    • http://thepnguyentran.vn/media/ftp/file/niziri.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5de69c275---kasav.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608303574aaf6---sakusudusolofi.pdfIn PDF document text
    • https://ive-cal.it/file/24048631867.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/lafuxuza.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/n2j2a2ssv3mpv0p9cadqq06530/40876800801.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_off0000e4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBC 18192 bytes
SHA-256: 1e5ae990e58f17a8b4c2b9055bfd0306fcfacc190de463f9072f0961a5b529fe
font_02_sfnt_off00012ae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE3 10864 bytes
SHA-256: 80433d2bd29b2dc09f6338646ca4cc7b5c1887df53523fcb87f60a06935c1449