Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddb892057f548693…

MALICIOUS

PDF

82.3 KB Created: 2021-09-19 04:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c54bf4e6e1e6f4f9ba10fde60c582e3a SHA-1: 1f23907f032c1b1b0c347fa4e2668d30633b351b SHA-256: ddb892057f548693e316df5217e2e2d2b3c3d3c27dc0b98ae7b4ddde44a332a4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • 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 http://mientrungland.net/uploads/image/files/nokilubodog.pdf In PDF document text
    • http://seghers.kr/data/editor/file/17532610386133487a17332.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/42390070318.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/41389636347.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/5145175193.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/texibopevaloroz.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161360a047a419---2933263045.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/lejipuw.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/34913571423.pdfIn PDF document text
    • http://www.moyekolodin.com/files/39721315786.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/73387655655.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/94769381132.pdfIn PDF document text
    • https://hoangmailogistics.com/asset/site/files/83699291654.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77516462745.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/25244117447.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/gaxid.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/siligano.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f207faa6ee---51406584344.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/3f506671c8da9c0d2a7fbf89596f9da8/89394207808.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0f71dde87---suximorigagarum.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/munatalularazuwewovu.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/pugebowizupok.pdfIn PDF document text
    • https://jotelek.hu/files/file/sigazu.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__61464E42C5856.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=screen+overlay+detected+solutionPDF 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_off0000dd56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD56 17704 bytes
SHA-256: 58ab3470599cd752150ba4a79f5b7ec29fcc7adaeecd3533ea4a4275ddc1c98a
font_01_sfnt_off00010b53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B53 10716 bytes
SHA-256: 0171cad175d078e04b0b46af23d2469967bab97162fa917497dacc07ccb2070f
font_02_sfnt_off00012411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12411 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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