Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca83d028b2ce1a36…

MALICIOUS

PDF

76.6 KB Created: 2021-09-20 08:54:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ea590f36c02703292d507a28f9571c5c SHA-1: 4a94be06fd4a711296c13c3831b830f6d343defb SHA-256: ca83d028b2ce1a3688c066490c0d5f0676e38f7b076ec0bc65f10e1f2eb2da65
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 disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure and URL analysis point to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://zdrowejaja.com/Upload/file/tezin.pdf In PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/fofazobugofalemut.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/fagapepesobejude.pdfIn PDF document text
    • https://cargotavio.ru/files/file/merunujotatida.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/favupobunemixig.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/xegexamugik.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/bilebujujevexadutu.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae8b8d8c7e---wirevunixosogerelebosolo.pdfIn PDF document text
    • https://reha.bg/content/upload/file/16922064679.pdfIn PDF document text
    • http://vidol.eu/userfiles/file/fefamiziriju.pdfIn PDF document text
    • http://goref.ru/files/file/zafapobolikub.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa08f212f9---78394166663.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/24703696064.pdfIn PDF document text
    • https://partnermind.cz/images/files/23719888877.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/35385260421.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/17726428963.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///wokikilazoke.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/94726173042.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/duposoxiwisoju.pdfIn PDF document text
    • http://groupelamiri.com/uploads/FCK_files/file/rejuguze.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/081853418039.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161318ffbb4865---telokuvovegefidudeze.pdfIn PDF document text
    • https://badrivishal.com/media/repotilamowoxiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=best+trucker+2+apkPDF 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_off0000c92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC92A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13C 16884 bytes
SHA-256: 0dc2f8da59a78e6788babb22774155580e249ed10e3ea3face9c10932d7000b6
font_02_sfnt_off00010d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D66 10368 bytes
SHA-256: f8e1be011e027f338bc6bd1d3dddd7a274400741beaf8059cff230763544d3f7