Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1a5f9e4b91fb48e…

MALICIOUS

PDF

92.8 KB Created: 2021-08-08 09:52:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ecaa6682ee4ef6818e2d31f31db39a2d SHA-1: d3e9eea2d0c8b6ed01c38cee3fe9188e025b77cd SHA-256: e1a5f9e4b91fb48ecfec96bac9b19c3ccff7829ef6e127b8a3a5016f868c98b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://pet.nfe.go.th/m_site/ckfinder/userfiles//files/gujevaxowupeduliberuro.pdf In PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/82266488714.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c64e0c148---vivowerez.pdfIn PDF document text
    • http://ahchala.com/img/file/92959478933.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c968d1e64a7---fepidefaterut.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5ac442caf---nofenug.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/3931822698.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/14043580761.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/e257a5f24f1a677f28be45a92b55f56a/45166314412.pdfIn PDF document text
    • http://atya.eu/files/file/13077617779.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/58143687470.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/fee464657e908e9d8f6c3e5a1bdab19a/fuvotezimegem.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/a3c63184cf27c2ff709bc0726b082f6f/wepedoladabe.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/tumibokopufurofuwivalaz.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/lofapakuvo.pdfIn PDF document text
    • http://zcapitalcrm.com/app/webroot/uploads/files/bepivibekapunomeriwowovo.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946ffad51c8---84430489578.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/eed9257984b481d7099429a7321314ff/36464990313.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/tarafipirupimekapudivate.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/87251191331.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160818a5c932e8---50588674079.pdfIn PDF document text
    • http://bigsvatcharasith.com/userfiles/file/76976069488.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210728_B8E450DDC94061CF.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/c5fe75cf0465f563aafd589caf32cb6e/95905520579.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/20459374812.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/2c1fb5a7e0be6f7de6cc98c63e89b3b1/14859836471.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=spelling+practice+for+2nd+gradersPDF 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_off00010560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10560 10992 bytes
SHA-256: 0e9389015f004dc17d09dace2c90daba52b3c21619109063014a6dfc334c01ae
font_01_sfnt_off00011ed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED9 17156 bytes
SHA-256: fb537f366c1e716b378c1ba9a2b479bed6af675563c855a40f6275c2263b41ff
font_02_sfnt_off00014c03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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