Malicious PDF — malware analysis report

Static analysis result for SHA-256 672bf6dec9f92313…

MALICIOUS

PDF

81.6 KB Created: 2021-07-07 01:42:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 24b2ab78a58abf3fac1a0120b2525498 SHA-1: cf2783015746861de4e96da3c0fba98bfaebecc8 SHA-256: 672bf6dec9f92313b2ee681fc72ceb4e77f7d0eaaf844103f24b3afee30ed223
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to potentially compromised WordPress upload directories, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm characteristics are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5544

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ce5ca72ec---vozejanamibemu.pdf In PDF document text
    • http://danburyhighclassof1961.com/clients/b/b4/b42d7d7907ff1a67dd6fd366dd3c6775/File/jidomewu.pdfIn PDF document text
    • https://termocasasrl.com/file/fuvukuwubutoni.pdfIn PDF document text
    • http://uamarkets.com/images/file/febolodepimonasarusawo.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/44074666411.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/06d52ec882b32b885f395b619802737a/26489099996.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/4935525746.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160805b87f3cca---91987013388.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/8e2482111ee84a6cd46fdb5a3fed6c28/61070404385.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/zumadibabafigokokidezeda.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/0787a0f3103490621303eed4118b3bbb/mimigu.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/bixolofoj.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/38776530904.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210618175302.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bcb582d5d7---tixobudozinunezut.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/zuginisaparilajo.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/68121171519.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/pobilufe.pdfIn PDF document text
    • https://cape-electronics.com/media/file/supozugemotodilom.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608219cb2449c---gegadamifasewud.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed2951aa79---vikaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=for+and+against+essay+about+internetPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74D 16540 bytes
SHA-256: 4604dcfb81235d8799a5e9bd8f47bc0b1d80236f9b68ed1b70eda2b476cb3ab1
font_01_sfnt_off000121d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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