Malicious PDF — malware analysis report

Static analysis result for SHA-256 9404dc52cde55194…

MALICIOUS

PDF

155.7 KB Created: 2021-09-03 20:00:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ca9234141621d61c734a5a4c27ee0878 SHA-1: 0524b3fa7bdfd9c80adbed5379948ef45a74620f SHA-256: 9404dc52cde5519471492776108021c66279bab532ad5f10821d400a62d22a15
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/9496006d1510cbd39014108605db7122/43760617576.pdf In PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ab973346bbce330d2adea978c18e7141/9645751015.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/55833772734a046bbb544224240fb85e/19664101318.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/37410364565.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160741854eb4fb---95980788757.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/wasobebitu.pdfIn PDF document text
    • http://nensi.si/upload/file/revizatumakikewowodonago.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161007eb4043fd---poxupotivigatidu.pdfIn PDF document text
    • https://hongming-eco.com/userfiles/file/pojasesoxuzewimikurekesaz.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16087344f345c0---25421067254.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160999e4bc7cbe---komuluwubilukexevanu.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/18547053237.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/wibel.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/c96dde626879cc2693275cbb8092f0ac/xuzuleninuxibapumexopupin.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/160978922460e47b45a8197.pdfIn PDF document text
    • https://primer-spb.ru/files/files/totasetibizafaxaze.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/kefosogenavajupex.pdfIn PDF document text
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/ruzimati.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/efqkjusrsirfsrpd1nohreotr7/xikeniguse.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/piralosuzavujaxosojubebad.pdfIn PDF document text
    • http://midel.me/userfiles/file/semaremitexopijujegu.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/repizimudanuxi.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/5d2ff4c7384f44446a91f1a57ae61146/rebeji.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/14897457302.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16288660166521.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=cardiovascular+system+internal+medicine+pdfPDF 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_off0001f9fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F9FC 11092 bytes
SHA-256: 506243ed3ba390f98868b3e8c01008cd3fe586f154ef7c4bba3468f5157b6e1e
font_01_sfnt_off000213e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x213E4 19888 bytes
SHA-256: c122b4a30e7a580d11e55215bfbd7ab003b75a67de0123c752375a31828bc028
font_02_sfnt_off00024830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24830 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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