Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b582b44efdf7953…

MALICIOUS

PDF

75.8 KB Created: 2021-07-22 03:33:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 17139689a45b52cc512f4b9546427379 SHA-1: c3c4ebb94cfff07eaa304cb0a30f6cc4a8297d88 SHA-256: 7b582b44efdf79539d40859aaca3ef1a822e8882ee7c761ae988ac92a0919207
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or engage in SEO poisoning. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it's designed to redirect users to potentially harmful sites, possibly as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://ajwatravel.com/wheelmarine/userfiles/file/69987885451.pdf In PDF document text
    • https://digireg.gr/upload/susabopi.pdfIn PDF document text
    • http://gewald.ru/content/Files/rapodevirekevafugovonol.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/zukukisepitejobika.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/2mbfocdnv1i0vlddb4iqi9p6g0/xojetopexopilofojanifa.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160be84fe37a60---12102652659.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/tuminowabudezenubom.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbab27d722---89317894328.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/nelovuvuvakozabokedovex.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/luzuv.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/7608207210.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160baa3ff3d072---92281346838.pdfIn PDF document text
    • http://canadanur.com/resimler/files/sibukexe.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210703175015.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/65143369098.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/10899902891.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/vitukuni.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/d7809ca79d7ae13d8f1728badf232325/gasulakiduxuf.pdfIn PDF document text
    • http://janandpoos.com/clients/872640/File/zusupatalo.pdfIn PDF document text
    • http://www.houstonorientalrug.com/ckfinder/userfiles/files/gexaletufexomatoraxir.pdfIn PDF document text
    • http://smn68.com/clients/75339/File/53918421874.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160af90a77ac1c---9990108092.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/jiregipax.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/rakoxagebiwewolurofezuxuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=hotel+pace+san+mauro+torinesePDF 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_off0000c5d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF0 10628 bytes
SHA-256: 979fbbdc5abf8abffb46d976be3fbf9fe4c919579fa79bb27118c2ab1ea53ab9
font_02_sfnt_off0000f62a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62A 16736 bytes
SHA-256: 0497eb05672e52e951c2026732a6af2377506438191b94cbee69917c8b630740