Malicious PDF — malware analysis report

Static analysis result for SHA-256 d024ba30fbd8240c…

MALICIOUS

PDF

74.5 KB Created: 2021-09-30 19:32:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 74c267a9f4fcfe91ae6d1c3745505c6f SHA-1: 16d39071e26109669514acd16ea2f8d207bec740 SHA-256: d024ba30fbd8240c2c53269afc87fb4f7e0d99d5e1c26deb9dd121073c300e9c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ketchas.ru/uplcv?utm_term=vpn+manual+android PDF link annotation
    • http://sipsak.nl/userfiles/file/67863761701.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/58669303313.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/60322258214.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/wevovu.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/bisipameburulolox.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/8r0qdnd55ujjparmc01e1m6ugr/98160567466.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/55627806203.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/dokesafalov.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613f880b6588f---74644424907.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/diwema.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/digup.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/i16r1iot5mcsm4lfg6uuenrkv5/17156028711.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/12445190367.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3763c1297---kutuxadale.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/40158306461.pdfIn PDF document text
    • https://gtsk.solar-napkollektor.hu/js/ckfinder/userfiles/files/43550901975.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///4408510689.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/66966511212.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/zenuxavusuveworarul.pdfIn PDF document text
    • https://www.miotsukushi.or.jp/system/ckfinder/userfiles/files/ganulamunedu.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/posimikuzo.pdfIn PDF document text
    • https://cmf8.ir/data/file/69174997980.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/37463811510.pdfIn PDF document text
    • https://clubselect.ro/ckfinder/userfiles/files/wuzigubozejevex.pdfIn PDF document text
    • https://dentrangtrisaigon.net/images/uploads/files/51965854307.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_off0000bb12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD324 19496 bytes
SHA-256: 9b7e20955c2c8bdaa50cfa10dff54dde52fed7eee50a0869845d298b8308705a
font_02_sfnt_off000105c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C9 10224 bytes
SHA-256: 287b4c41ece36e61ae50efd23ec60c8b6cfbf6cbbbd208ba755a0e7145d66934

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