Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0829b803dd6d8cf…

MALICIOUS

PDF

73.2 KB Created: 2021-07-01 15:18:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 397b95323236912c72d8c6791a92225b SHA-1: 6039e3b4a5ebac83d49de179a49acfa8f177f415 SHA-256: e0829b803dd6d8cf42ba6a3dece7a21a6ed57093a6bbfcfee6ff87104b8bf753
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised CMS upload directories, suggesting it functions as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted, but the structure and URL patterns are consistent with a phishing or content-luring attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1608658f84404c---27181568547.pdf In PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160786ab7c15f7---ripofedovanizofadimisil.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/vcfmupamebt6fjmmh8vt6pge56/wamaxitoxo.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/2709fc84a775450e45e6bc9276ef996b/nopadulelezugowinoz.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/49937919070.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/97857147370ec45eb7aecce25e1bfe78/lomebexusitoniveju.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b19254350d3---damofuj.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/abhf0rfb0u3aua3heueg59d980/puboxatawoso.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdd53cf0e0---68212123574.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/xememezelo.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/lo7cl0b9355hrl5bjsp14bj466/rejur.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/c4c49839eb8afcd979d05c199b4a2ea1/50217447686.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/37568830437.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/29d6a9eb8159e51636321655d9105b30/97279717538.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbf3538688---mavimefedebozuz.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/b5ccad47ed45c0493f31208bd2b21bbf/rodevebudoxusojoza.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/c8fd3abaf6acf45755f2546faa64e010/95692447816.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/i7afn7atqhmjjo8p9idiurvft7/vizevumelatetekogomu.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607312ea6faf3---60455429323.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4fb6a8f97---91573945374.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/32933947177.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/tc1paud6fg5r4au11vntg0pop2/xaxukoduxuwodatesufop.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/b9c5012hq1uj6its6au9v8lds5/xumilediju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=phone+number+for+luigi%27s+pizzaPDF 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_off0000bb37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB37 16860 bytes
SHA-256: fa2833f2824e375df247c796ee30db346aa7593bb1e23de0f7b6daed187bdacd
font_01_sfnt_off0000e637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE637 11044 bytes
SHA-256: cc3dacd0423211573804a7768a5d008717496ab108faaad1acf24181d0de4b67
font_02_sfnt_off0000ff7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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