Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc43d0187308273d…

MALICIOUS

PDF

86.5 KB Created: 2021-06-12 18:45:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: dadd71ec08b667c7fd5ec107abdd3a90 SHA-1: f298f6a2d314baf6557dfbeedd425b478a96becf SHA-256: dc43d0187308273d3496e98d46e8209f96ea96406c675a76dd2c07243e70ec5d
164 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to trick the user into downloading a malicious payload. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body text, though garbled, contains a URL that aligns with the link farm heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crewmak.ru/uplcv?utm_term=babul+ki+duae+leti+ja+video+gana PDF link annotation
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b608b30b9---37872413127.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/8lm1i1o45son9i4afcmitmqgm5/jogamodawugapaliwexoweke.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f55edc1a7c---55878488953.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/3e70a56c5db06353c724aed63ec0942e/27743198047.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/j6cvqnfh47ltq5vqc4q26rvie6/bofivewu.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/78941830149.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a40a9e76926---nuvof.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/widezijaziralobefi.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/62354a8c51d13ce588ae586056ead458/riwojezag.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/zipupopekesedogitav.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/5fe14c0bfa259c32702d20088bc09cd5/nudenerenexumupo.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/12120818362.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/95965653024.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/dosexaxawufima.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c3223c289---lasosewizisafokajaked.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/16200836116.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF169 5108 bytes
SHA-256: 5be7b3ef399394d67bbf0a617879e6fcbfff0a28c96f4d2e90d22de263d1f1d0
font_01_sfnt_off000102ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EA 10596 bytes
SHA-256: debdec2230a19240c311f8383d07981a7f6896bc760acc800515ad74aa93799e
font_02_sfnt_off0001275b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1275B 11640 bytes
SHA-256: 52f1f81e2109199776754dd84b5a5368bdb5e3006047adcf1c2bc5050c68e476