Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b5208fd64e118e1…

MALICIOUS

PDF

84.4 KB Created: 2021-09-11 17:25:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c71f0bf88ff6f0534a13f1ac8a77145c SHA-1: 2d5fa424671f4f64e6c14436074e477f8f66e26e SHA-256: 8b5208fd64e118e1f9f47318e7c78a99ca3577a67863ecaa8ab20939859d2a64
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external links, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://makenie.com/upload/files/79714173412.pdf In PDF document text
    • https://igraonica.me/userfiles/file/xugetire.pdfIn PDF document text
    • http://leeharringtonhomes.com/userfiles/file/xekevogefumifilavezadeb.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/gevifimazaf.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/penipogavopukemoziba.pdfIn PDF document text
    • http://orenprom.com/img/account/file/27501519121.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/28859531456.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d6cc05064---23283633306.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/96921869076.pdfIn PDF document text
    • https://tuinvandecruys.be/file/rawadedopefowenasivo.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a99db9ed16---8240221379.pdfIn PDF document text
    • http://kebirbeton.com/userfiles/file/46077998030.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/45945107690.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/mumeremaku.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/96140706313.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348009aeecf---84918478615.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/pogamowagusipu.pdfIn PDF document text
    • https://kimcert.org/E/file/fepofaridogi.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/dutugimojidakejasegazeju.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/21c571a03ccd6faeb9e61836ef91f954/kosefojuturefevu.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/zabesonumew.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16133b2c7336e0---49911876185.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/mogaxeli.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/fufeteguz.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/57773622335.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=adventure+capitalist+unlimited+moneyPDF 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_off0000e236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE236 18380 bytes
SHA-256: ccc339b01d864d3a2a276f37736f3176d931311d266417b6327343e20d96101c
font_01_sfnt_off00011255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11255 10936 bytes
SHA-256: 23ebc3a3610d82d9858f30feeaefb8abb31706bdc9bf7e1886ad640407c3cb51
font_02_sfnt_off00012bb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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