Malicious PDF — malware analysis report

Static analysis result for SHA-256 445f6876fda71e39…

MALICIOUS

PDF

72.6 KB Created: 2021-09-02 22:27:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 14144f5267da90969e63345e3980ade6 SHA-1: f173eff0e62c7edcf1af35f5989efb735e1f2c1c SHA-256: 445f6876fda71e39e24138bc629752d928389b4e2ebb45e831365ab1aad5c0c4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised WordPress upload storage or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://teamtrinity.net/trinitya/file/71767201211.pdf In PDF document text
    • http://rulada.by/upload/editor/files/40799807240.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/xotizoduwipejeg.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/wevibapesedutosov.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bdba7165d---73043308744.pdfIn PDF document text
    • http://4bx.pl/public/file/suvunilurogakug.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/mamak.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/nizotekurap.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/4007290820.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/delukog.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/foxodurodelaz.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/zituxo.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/bitaxosajaw.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/lejamisukixebelis.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/06/18/2183841385.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16085435e22c91---74134818983.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/siwokoda.pdfIn PDF document text
    • http://vswet.ru/f/lenuf.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/togojevatu.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/jafikejibirebunap.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/tojila.pdfIn PDF document text
    • https://mintowncoffee.net/uploads/images/files/23729203629.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/e91bd1bacef5c2bc39220ccbae6ed1dc/vuzebavibapovupazezola.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=ramleela+natak+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_off0000b831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB831 17336 bytes
SHA-256: 916d65afb2a089477c04ff0433c589cf2fec450632fd2bbf01712fa22f2fdbe1
font_01_sfnt_off0000e579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE579 10316 bytes
SHA-256: d8ed5a3e1977de4da0e48cab3e26af91fe2388faf96bd0ee983b2d30da746e65
font_02_sfnt_off0000fcbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1