Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bc6445840883f88…

MALICIOUS

PDF

109.7 KB Created: 2021-09-15 13:49:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 320f161f1cc9f57e030718ea26f3b0d0 SHA-1: f32e907950f86971fd6a721f7a42783614d71b7e SHA-256: 7bc6445840883f88a7ae81451514009fa5cf1b5cdbb3864765b1f7588ed01bc2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. Multiple heuristics indicate the PDF is part of a link farm, with several URLs pointing to potentially compromised or disposable hosting. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://snieznik.pl/userfiles/file/xikuzulewidabevirudoje.pdf In PDF document text
    • https://topinsolventa.ro/userfiles/file/67108921535.pdfIn PDF document text
    • https://euroialinsol.ro/userfiles/file/garavek.pdfIn PDF document text
    • http://goang-hann.com/uploads/files/202109091931517275.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/33562252771.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/wefizujevebob.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/9b24ca94103b36b7beaec1958617657b/robagopinasibuxizazaburux.pdfIn PDF document text
    • https://alident.centralcms.cloud/galeria/files/moxudap.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/54491565473.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/93430401654.pdfIn PDF document text
    • http://karthikeyanjayaram.in/userfiles/file/bujaworokule.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141750b07b0c---doxusi.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/nonanifez.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/20683371570.pdfIn PDF document text
    • http://bratislava.topenglish.sk/app/webroot/gallery/files/labelufebudog.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/cf382772dbdccf6691660c2084661628/85328495435.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/24592815223.pdfIn PDF document text
    • https://adverto.ee/userfiles/file/47562245597.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/28107173156.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/51277026976.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/48563535835.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/5824df9aaff0893ac77e2dd7d67d5887/xegugubowamorar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=the+leftovers+pdfPDF 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_off0001471f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1471F 10268 bytes
SHA-256: 757ab8ef90d042f964bbd9aea5915926e79a8a7346912078059bcf669b10d5a5
font_01_sfnt_off00015e67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E67 19404 bytes
SHA-256: c67a1d6a7cbe6043fc125cc54a2d6199efd71f469e5c6bb2f331a1bdc87e17e2
font_02_sfnt_off0001918c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1918C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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