Malicious PDF — malware analysis report

Static analysis result for SHA-256 046d0051c4ccc263…

MALICIOUS

PDF

78.4 KB Created: 2021-09-20 15:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cd4bf8c54d0ea4ff6ea27f31d85ce177 SHA-1: 158cfc981767f0a6e282ad649600ed08f0ed6897 SHA-256: 046d0051c4ccc263832b40ffa401ae06b2dee651edd2a208ce589ad2a5eeacc3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs, several of which point to compromised WordPress upload directories, suggesting an attempt to lure users to potentially malicious content. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • 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://zaragozadenoche.es/upload/files/nuforarizilexapamuvu.pdf In PDF document text
    • http://nwatchonline.net/userfiles/file/15730959627.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613226f73cc78---15039304140.pdfIn PDF document text
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/91099842488.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/tofabepinozewuxegitaw.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/nomaboritirunuvoridi.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/4630074841.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/c6c34e26b6fa097315d39e8b8f7bbd7e/63951336143.pdfIn PDF document text
    • http://fitviewer.biz/files/file/pesiwazawataraweb.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/borisag.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/68684534862.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/rudipu.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/xosemupunos.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/80664543628.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/53655935965.pdfIn PDF document text
    • http://greenhousehotel.vn/uploads/image/files/87913494486.pdfIn PDF document text
    • https://sim2007.com/files/54317098204.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/042c7213105f25f773dbace8965451b2/lezoxakobiwinubipokoso.pdfIn PDF document text
    • https://ocw.tw/uploads/files/65746174139.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/15161490107.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613655c69e52a---34041387263.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/4751524585.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=latest+naija+songsPDF 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_off0000cc34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC34 18796 bytes
SHA-256: dd0c1c5531ba6642c6a46f68d5df5752c18d5929d54c91b287ad0f4e560da7f6
font_01_sfnt_off0000fd40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD40 10224 bytes
SHA-256: d0cafb10f3eee197b29e6270cebe2d336d91b087f63c3a9b49029cdc5f3fb428
font_02_sfnt_off00011451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11451 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1