Malicious PDF — malware analysis report

Static analysis result for SHA-256 217f7b1327bdc9c7…

MALICIOUS

PDF

83.8 KB Created: 2021-09-18 17:06:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 69656cefb6a7b4a675fb4332f3f3bcfa SHA-1: 87c4b7728bed80795330e593c375eaee10171a6b SHA-256: 217f7b1327bdc9c74e04aaa0aee649b44ba0e4dac2c9c7826e870f701b0964e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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 http://knauto.com/upload/file///97873062233.pdf In PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/44342061871.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/65456820189.pdfIn PDF document text
    • http://delfosventures.eu/userfiles/files/dutasixubureseremogan.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16139d12308598---2357230678.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/11143654892.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/mufilosuxe.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/56546056596.pdfIn PDF document text
    • https://pierrelemagicien.com/userfiles/file/94792490612.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/takatezuvilakinojewevo.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/8ac738dc18e990930d2509341563dc8b/38539956470.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/45510315186.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/kiniso.pdfIn PDF document text
    • https://sbmhavacilik.com/userfiles/file/kidomaxasuvijujanom.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/xulopotativap.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/nifid.pdfIn PDF document text
    • http://laiksmodalux.lt/app/webroot/uploads/userfiles/files/warixotakozotipinileto.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd77ab212e---64724812606.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d81ee83473---rivetakirakoxi.pdfIn PDF document text
    • http://santeh.md/img/files/7837571370.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613664dca1558---48916255718.pdfIn PDF document text
    • https://braus.uz/images/shared/file/dozidojenowina.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/13790787867.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/vipubetazezu.pdfIn PDF document text
    • http://musorcentrum.around.hu/files/article/file/31716147807.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=emoji+keyboard+premium+apkPDF 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_off0000d605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD605 22744 bytes
SHA-256: 8954b0d53c496c8ab79cd32e31c7780905288d111aff24822668347f1f8836d5
font_01_sfnt_off000111ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AD 10696 bytes
SHA-256: 94b00385d77046590e779019bf02624c79df1999e64037f926f4f8ed26d457f2
font_02_sfnt_off000129e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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