Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e4904dbbb554928…

MALICIOUS

PDF

92.0 KB Created: 2021-08-11 19:24:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: c57d2f7e1c40791b01485022eb27c44e SHA-1: 93440d51177590ff5cabdeba6540a82d080083cd SHA-256: 9e4904dbbb55492875a2ea258fee76c880fa7daf7f68d62cbff43022e6c5d36f
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, indicating a link farm designed to distribute malicious content or lead users to phishing sites. The ClamAV detection and ML classifier strongly suggest malicious intent. No scripts were extracted, and the document body was unreadable, but the presence of a link farm on compromised infrastructure is a clear indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b65cba2809a---61109330107.pdf In PDF document text
    • https://agrilaui.com/userfiles/file/1898725241.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16074431e4d9db---zenerudadukam.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kibuponater.pdfIn PDF document text
    • http://mousike.it/img_ins/files/91384669351.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160acb35adee04---47445302612.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/47bba993854c6e4582589b84753ec4c9/45741181657.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/6eb9394231b6c7ade34995f3dd3dad34/zavipenijixofigonubikigi.pdfIn PDF document text
    • https://buyafranchise.org/files/files/tovidutugunimiw.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/45007757464.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/9500800455.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088b2ee863c7---riroti.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/80805274906.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609849b5e883d---95461487034.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/15838946030.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/diderev.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210606_98F8B99D33319593.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/vesafafufade.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/4af8f14f685f09d337c543710e38ebf8/gonesimalozepetaxo.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f22869428f8---ragewabigekozomuful.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/29822407488.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/84214623260.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/176346d888ea82ac192787128c2b96a2/jitotavizemoziz.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/wajeziwizusa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=solutions+manual+introduction+to+real+analysis+edition+by+william+f.+trenchPDF 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_off00010009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10009 17940 bytes
SHA-256: 820e08b3899a3ed2036b55e0895136686ce60e0928b1f40bfa4cbe6e8eeb7cf7
font_01_sfnt_off00012ee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000146fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146FB 11324 bytes
SHA-256: d4f4a383ecffc14432d30325087d1b6f49c1eab690c699186ac5c0eb98de25bf