Malicious PDF — malware analysis report

Static analysis result for SHA-256 984393627dcd7cf2…

MALICIOUS

PDF

97.7 KB Created: 2021-09-17 10:34:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e6563324f2a6dac257c4f6761587ed5d SHA-1: 744e2ca8bee13497195398c2a576f725bbd0ce2c SHA-256: 984393627dcd7cf22aabe85089ed58f1988a19031b93499a6aa86d501c614f51
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://catamma.ru/uplcv?utm_term=guerra+y+paz+tolstoi+pdf PDF link annotation
    • http://nadiadsa.org/userfiles/file/zubutodixusupiliv.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/najiwoxamuxuzulititugux.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/25534420131.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/rivuxex.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/lulufadizupevinuruj.pdfIn PDF document text
    • http://vetsnab32.ru/userfiles/file/76849571832.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/xubowalijemidepelejodigeg.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613719f70245d---54790882498.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/89770601170.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/l7o7mfs3v8qfgu56ju8p9me4um/nipukowatifas.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/sizavixag.pdfIn PDF document text
    • https://guenangequitation.fr/www/site/js/ckfinder/userfiles/files/4479093112.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/bojilito.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/1165131653.pdfIn PDF document text
    • http://frickcontrols.com/uploads/files/65221185013.pdfIn PDF document text
    • http://charivne.info/images/file/51366917985.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/xisivogodux.pdfIn PDF document text
    • http://bsa.by/ckfinder/userfiles/files/furedaloziniwenol.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/fivamulezaxum.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/gobujozufad.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/soxuxujelegelivutejimujas.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/6654288442a2ba9f5c80682faa707ee7/zerutovutej.pdfIn PDF document text
    • http://eltprof.ru/userfiles/file/88170506314.pdfIn PDF document text
    • http://getdol.com/page_data/file/wolitomajev.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/nazajoragoxi.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_off00010ed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000126e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E7 10700 bytes
SHA-256: 247e637aac8561171373242d2a5d3068be23290d443046690cf31600289c4ab5
font_02_sfnt_off00013fa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FA9 23312 bytes
SHA-256: 4d5c70960c86c0c66974b41e601afba45bc397b696660d5e68001c294d5e7da7

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