Malicious PDF — malware analysis report

Static analysis result for SHA-256 e00b882a9b3ab9cc…

MALICIOUS

PDF

70.1 KB Created: 2021-10-03 03:01:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5c07516ebf5f5004f88ff0fc78202c0f SHA-1: 2e0c6b6d15ee39921e37e0e961926f50bca909bf SHA-256: e00b882a9b3ab9cc525cdf6ad7c1497d22ed806be33828055b9624157db68242
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest a malicious intent to redirect users to potentially harmful content. The ML classifier and ClamAV detection further support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://greensquares.in/userfiles/file///xuwogoposeke.pdf In PDF document text
    • https://ww150005.linebot.net/upfile/files/20210909211157.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/rewomewodurijile.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/22645844637.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/17234039701.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/xufetotojusorufo.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/rovanivifodobojefojavira.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/rokawumol.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/19185607158.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614167a03153a---91156453593.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161345e8995a18---50134322750.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/71701980801.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/vijejazubelerinijazejanux.pdfIn PDF document text
    • http://parquet-cortes.fr/data/Files/27469815962.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/fumewomisikenaxe.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/wuragifuvela.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///31131677224.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/masikipasozagekoma.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/161382918485e4---90614232672.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/55100963506.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/1008961246.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/89966352317.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/26605428562.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=conflict+analysis+and+resolution+majorPDF 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_off0000b16a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB16A 15556 bytes
SHA-256: 6b04317cd7bf493416f4a9e2e60cdb2b1392cecfa3982090c960365d9f776b93
font_01_sfnt_off0000d8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E4 11012 bytes
SHA-256: ad4dab0b776bc5832409156da66dd96ea21f79b1a30898a54e5fc9f6359cb08d

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