Malicious PDF — malware analysis report

Static analysis result for SHA-256 35de2f81eafa59ec…

MALICIOUS

PDF

81.4 KB Created: 2021-09-17 14:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 540cb05938cd9062fc84ef8782a29d92 SHA-1: 799f2e37de3f77690f9cc5cffb917e12b03170b5 SHA-256: 35de2f81eafa59ecb68076849b13a9715cf124636fa6e54699e096bf6716a6da
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://drafthe.ru/uplcv?utm_term=case+in+point+book+pdf PDF link annotation
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/68048767307.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/74611753267.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/basijazonopeja.pdfIn PDF document text
    • http://livestocktool.com/d/files/38695683679.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/16952812144.pdfIn PDF document text
    • http://vkts.se/userfiles/file/52637026814.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/81361487442.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddc110307c---99334950676.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/18270426719.pdfIn PDF document text
    • https://eetravel.net/file/23611820391.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/2n53voafjtrg6q3a8uau2hhgm0/tudukomi.pdfIn PDF document text
    • http://vip-cond.ru/userfiles/file/28967746325.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614163a762f46---muwotejotix.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/takipobexopozitulipajo.pdfPDF link annotation
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f5f240625---74626582456.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/visunurumexigoduwup.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/27796304444.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/69505998493.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109032333451920.pdfIn PDF document text
    • http://coolscape.info/images/files/jisule.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_off0000da01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF218 10608 bytes
SHA-256: cb2018925879f369ca9b2ac91f7c6baec73df1cc99f99db20d8081dbf46faf15
font_02_sfnt_off00010a3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3C 18056 bytes
SHA-256: a90b550d5d2d9e7d826550149bfbfe7a33b9c7088f39b9d50951e9e210fd4b09

Open this report in the interactive analyzer, or submit your own file for analysis.