Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cb5e7a6e3214e00…

MALICIOUS

PDF

80.9 KB Created: 2021-09-18 23:50:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 33d8390bd532eae84df207ddf7f52f72 SHA-1: 29c5529397b988bda432bd34158f9c6a9df8e960 SHA-256: 2cb5e7a6e3214e005a2763386e0f2edeeb6e454afff2e156a6918ad727073e71
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of a link farm on compromised infrastructure is a strong indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386a3517875---vikumexofezemere.pdf In PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/dirixususekibewojudolex.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/dojiwawak.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/44522402214.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/32151588569.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/43855227695.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202109092252575089.pdfIn PDF document text
    • http://nenorm.com/files/files/94600120724.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/71590820682.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/wumilujuxutisenedive.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/37686939076.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/nuforenepowoniva.pdfIn PDF document text
    • http://koreaticketland.com/userfile/file/73635469939.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613759672ae24---fojawevubibal.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/41416074618.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/35295788081.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/mopezijo.pdfIn PDF document text
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/jinurakafub.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614120afb77b2---jikixukesas.pdfIn PDF document text
    • http://esistore.be/userfiles/file/lenesitavevusufigufog.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/godup.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/vetapalafagizorazeb.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/5bc134b83e68f1328637ae0984011af0/fubirilemafako.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=av+voice+changer+software+diamond+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_off0000d91f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91F 16768 bytes
SHA-256: 94c638409477ac9166207b332dec57239127bd4c4f0a8d4e3253d2ebe2482db5
font_01_sfnt_off0001047f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C96 11008 bytes
SHA-256: 219ff0b4e7a36074fcc982e6bd6e837e8c8e0f88bb5295acedd38c0c3976609b