Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5e539736e6420e9…

MALICIOUS

PDF

77.9 KB Created: 2021-09-02 23:06:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3abf6eafcb0780bbda5a90435c72e410 SHA-1: d4834d07e09a76ab73be2ea33a029f169c6de1c1 SHA-256: e5e539736e6420e944e1a47185a6e288251aa9c2ef45beb4f9bae4cd4c82196f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file containing embedded JavaScript, which is a common technique for delivering malicious content. Several heuristics indicate the PDF hosts a link farm pointing to potentially compromised or disposable hosting, suggesting an attempt to redirect users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vhshf.de/File/namemikodorajuve.pdf In PDF document text
    • https://evermoral.hk/upload/file/1624687283.pdfIn PDF document text
    • https://museos.comarcadelasierradealbarracin.es/ckfinder/userfiles/files/fajejazewipogojajaramusu.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/kokejalifeg.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16087d3a60e168---sixujasukabunujesipedo.pdfIn PDF document text
    • https://xinpayflow.com/ckfinder/userfiles/files/12563462652.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/wakasumaralinuxo.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e77ced4305---vurulevudub.pdfIn PDF document text
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/ssa2tk9sbebsin8j8m3sbllvb1/38719338715.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/86958988639.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/dusiguzitugisivimadupadu.pdfIn PDF document text
    • https://reclamesticker.nl/images/uploads/file/In PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16071fbf54ff8d---bomizexisaxafiwi.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/sapobisikejesegepivipanup.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de370c7ce09---jujumukikusopid.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202108241313563255.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/94362051459.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/fokasulosezaxu.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/tarexamugixikoxorodaji.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089fdf319bab---rixumibilezavikabuzatad.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/kakaxowosekoxabaviwon.pdfIn PDF document text
    • http://runhouchem.com/upload/files/78000782566.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/bijemajorosax.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/gosogonitagokigujorewitem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=ojas+call+letter+police+constable+2018+pdf+downloadPDF 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_off0000c5b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC8 18704 bytes
SHA-256: 912d78e096eb14d9036f4d6b38929a4b78655f2d1d0b0577739ff30da97f4ccb
font_02_sfnt_off00010e1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1B 11496 bytes
SHA-256: 2beb21a4b6c8fff2eba7c42fda909cbd547304cc0066f9953fdded63b5b2793e

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