Malicious PDF — malware analysis report

Static analysis result for SHA-256 84e7262097eac857…

MALICIOUS

PDF

90.8 KB Created: 2021-06-27 12:55:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cbc9704599013f83a8ea3dd1c3c34820 SHA-1: 55daae7b88a9cada3bd1ba719482e079f64f55d2 SHA-256: 84e7262097eac857959435ff26337dc8787550c07bf27c2f226430f91c3dcd52
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of a link farm and compromised CMS upload URLs points to an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 6

  • 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
  • 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://pozitron-s.ru/userfiles/file/55618408482.pdf
    • http://travisreunion.com/clients/1/1d/1d9c560ef9ee6310b862f4c9d288d7bd/File/74621189625.pdf
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/zulep.pdf
    • https://fanaf.comarticle_ressources/file/vezafogobevekimajofum.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084df86b8380---15951681522.pdf
    • https://solidpractise.com/files/userfiles/file/dusadedis.pdf
    • http://project-lovcen.me/userfiles/file/mogamab.pdf
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/aa5cc8c7ca74cd33f3fed0661101f340/rifabuzakaro.pdf
    • http://anandtouristcorporation.com/uploads/8444664820.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/ch8o775c2g2j7cmg7fh706c5n6/widugipipabi.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960d370931d---rixoj.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/32d8ff672fb4aaaac9c1816997132479/39566914499.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd32f87cc9---vatenuxa.pdf
    • http://anhuifan.com/upload_fck/file/2021-6-21/20210621215207700153.pdf
    • http://chalappuram.com/userfiles/file/kutijegixelenegutosenufa.pdf
    • https://jaiminsales.com/ckfinder/userfiles/files/kefus.pdf
    • http://tuzvedo.hu/elemek/file/22605784110.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aac864adb97---zagujenusizafaliku.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/1814efcb8cefb8d486be2d025bbe5a91/87389935982.pdf
    • https://kisikana.hr/userfiles/file/lesaxupugidepupan.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/828135030f29239c98407602d3b06c7d/66438028725.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609252ae5195d---89101620278.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc0b494705---69551136969.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608acc2495fc9---87003374609.pdf
    • http://nexxosrealty.com/userfiles/files/fewid.pdf
    • http://www.sport-konyv.hu/userfiles/file/verejuwaguzifanisubo.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d395160f9---pizobofuj.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=cost+and+value+management+in+projects+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb1e.bin
269b2f64a31465799149f73e6c3820216bee09e0db20f894a8316823f9817edb
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1E 11288 bytes
font_01_sfnt_off0001156c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1156C 16792 bytes
font_02_sfnt_off00012d7e.bin
b78dd445ab5d16c56373e263b888885b8fbba81b404e7985bf1c510eb0e16a37
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7E 17696 bytes