Malicious PDF — malware analysis report

Static analysis result for SHA-256 e927ec2d7abd52eb…

MALICIOUS

PDF

82.3 KB Created: 2021-09-23 02:22:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b2a632d4a6258d3235f321ae4fc99668 SHA-1: 138d677057d1f3fec2bb94aa485f4a4d7a6f199e SHA-256: e927ec2d7abd52ebd292feadeb7c802275cc3e2eb344b91505b8e140613447cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or delivering a secondary payload. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://medvor.ru/uplcv?utm_term=message+download+failed+android PDF link annotation
    • https://indobaliart.com/sitefiles/file/3846114684.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/v9dq23232sohaviojv88688ec5/23707260029.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/pexuliwimawafipil.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613af6b60f0f4---nomijowigonemuwonutugibe.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/39987456585.pdfIn PDF document text
    • http://steinbach.casawell.tw/userfiles/file/zirobuniwuwuxujen.pdfIn PDF document text
    • http://domuran.pl/files/file/61750919364.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-8/20210908110059351719.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/30311057098.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8d200dd47---lepagopudinuzajerili.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/kapuwesilefogiwosamado.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109100001246658.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161301b151b3a0---vigom.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/89663712475.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/tolinikigudipamika.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/6209747599.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/piguvutuxinugafe.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/xawopekibamawobumuda.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/12058004727.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/11008414958.pdfIn PDF document text
    • https://hsse.cl/files/povonabiwosifokorali.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/db75a309f0e9701894de33b0bfaf4d8a/58648930063.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/13476012272.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/29453415039.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_off0000dcdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F1 17852 bytes
SHA-256: 31c320e4a3ae7369506b23d7193e71d49d8460d1c1f97b396c986cf7f744392d
font_02_sfnt_off00012340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12340 10508 bytes
SHA-256: fab0375030dde751049d75a3b74c567f7f73a669e0781aa932cff32b06da913c

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