Malicious PDF — malware analysis report

Static analysis result for SHA-256 e553d8a89ba8ebee…

MALICIOUS

PDF

72.8 KB Created: 2021-09-11 02:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f47d1e57b5524b0999398411b3f817ab SHA-1: 6290961306e0d1789a4e8068c809b4fc948cce75 SHA-256: e553d8a89ba8ebeecb96dacc30286b68f59bba552ea8741715ae2b6a700cc65a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bukharaalpharetta.com/sites/default/files/file/palofipuxidojosabejadem.pdf In PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e03b3b9ff---96377051769.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/mubivadalabu.pdfIn PDF document text
    • https://isitekmuhendislik.com/userfiles/file/pojufiwomeremenibazaxore.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4f7308fbf---45876870800.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3d509213c---gurezuzagepaxefopagesar.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/29955367538.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/purole.pdfIn PDF document text
    • http://sb-78.ru/files/file/63376650370.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/jupobirejejufe.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/nufokovaxab.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/31231072808.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/reletifazajikefebujowu.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/26296397774.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/kopodadujijinejisetofedu.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/luwaxenegiwegadawadiw.pdfIn PDF document text
    • https://viktorina.ledoritulys.lt/files/rowuni.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/xedotif.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/lunidomixokug.pdfIn PDF document text
    • https://kimcert.net/E/file/1507168354.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/kadavubijafifokobiwo.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/vagesizuguwiforipenozaja.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/zifanol.pdfIn PDF document text
    • https://specializedfacilitymgt.com/public_html/userfiles/file/51588287324.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/17791125232.pdfIn PDF document text
    • http://findusafranchise.com/files/files/8585944336.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=new+santali+song+2020+download+mp3PDF 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_off0000ba08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA08 11112 bytes
SHA-256: 66ccb53fd3aaa3faceaf373ed8074e19a88afda383e33c9e6ce7350a71383c18
font_01_sfnt_off0000d3dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEF 16356 bytes
SHA-256: a44efc8900fa920cb3ee84dd7e909da15f706e802a4ae663b2d94f6a95d32fc5

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