Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d37b8ace1a44f03…

MALICIOUS

PDF

92.3 KB Created: 2021-09-17 03:51:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: cc4d68740e4d9efdb0ffe45dcb4ecb99 SHA-1: 158007d72393f6520d85ed2f51d62f9b763c5808 SHA-256: 2d37b8ace1a44f036c102d3b65134fcd44d8a74f5db5681d78d0a66c15a13470
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by a machine learning classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The file also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised domains and disposable hosting, suggesting an attempt to redirect users to phishing sites or download further malware. The presence of embedded JavaScript and the link farm structure strongly indicate a malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 https://oniceh.ru/uplcv?utm_term=one+movie+online PDF link annotation
    • http://encino.kopanramen.com/uploads/files/70301088651.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/3412603674.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/gogutinodigadan.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161352d159bca1---49663898049.pdfIn PDF document text
    • http://toyotaprius-custom.com/js/upload/files/fomilulebutepaba.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/povuberixubazov.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/datusaridubukovuninuz.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/65331963522.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/redoduvujaguzozagodogigo.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/zodado.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/43676805620.pdfIn PDF document text
    • http://lpxs168.com/filespath/files/20210907065042.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/salaralonobitedin.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7a91b09dc---rugoxezumumujuwoki.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/3edd0780fb83599d67e12d9431ed284d/rironidibukafa.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/nuvipugewagademo.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b1765099d---gepuzag.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/307098077.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/79214560002.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/matavupipokajelevitur.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/putabenobafizilaf.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/3450093030.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/40533764622.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/161420a7a62c4f---35623459355.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/kabozadaneno.pdfIn PDF document text
    • http://nhanvietgroup.com/demo/xay-dung-tnx/upload/files/gegedesozijosotofe.pdfIn PDF document text
    • 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_off000108d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D6 17440 bytes
SHA-256: 6c17931fa63cd2c4e9a601660e9b1330927ef896aa57a9844eb935674921aa43
font_01_sfnt_off000135f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F3 9832 bytes
SHA-256: 3d3fa4af1961e17cf1c7d644be9d43654422f0727b9fe24ad34866b36d986e82
font_02_sfnt_off00014b74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1