Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdca6a4af8e144ef…

MALICIOUS

PDF

73.7 KB Created: 2021-09-02 15:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9e702e3140f7cc9756b1d98975929d74 SHA-1: 493c4bd7e1d3ba55f0bf77f2b93b04d37754a737 SHA-256: fdca6a4af8e144ef20aa7db5da73922acdeaef3191cf9489ab5ce4ffcdf10753
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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 https://ketchas.ru/uplcv?utm_term=tank+gunnery+manual PDF link annotation
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16083fa8f0762f---50075848158.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/sezaxejupanibawi.pdfIn PDF document text
    • https://ready4use.ru/uploads/files/39433020856.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/32613934f8e5cd39c170a7e9d84d77a6/26928319522.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/5csdrgtv7p4ak89i1d52dm5j13/23477430885.pdfIn PDF document text
    • https://pratham.one/file/47876293960.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/bokozubejak.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16070aa7770521---xedevotapemumuvumu.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/82082526313.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/rodiwixub.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608791b7e4d05---37166451035.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/dufezinipabere.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/takijerunoz.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/45095769336.pdfIn PDF document text
    • http://nguyenphat.com/public/default/ckeditor/files/30370041427.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/vojinavub.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c20d3a5106---61401463442.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/33737211647.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-7-26/20210726034441197308.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/0bb4abbf7d14512b16aa67328cc9bbee/fafudegukerugizoluwopareg.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/87719367236.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/23929141062.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/jumosagefizijuru.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/20537891144.pdfIn PDF document text
    • https://bdsvieclam.com/upload/files/veguvapowopexuzu.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160abf0b67ed4f---18031648600.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_off0000c01b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC01B 16192 bytes
SHA-256: 1ec861637eb85d63a7e732b9147e49604bef9a7a0c2eb8428c08271dedd2aee1
font_01_sfnt_off0000e9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D8 10240 bytes
SHA-256: 239b61e4d6f69111ac39fe0bf081ecd54a8e62e8dda6dcb18d48ed9f0ec458c3
font_02_sfnt_off000100d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1