Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ca0e65507640022…

MALICIOUS

PDF

89.7 KB Created: 2021-08-03 05:44:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 93b6df32f895778eaec23e74b2584b44 SHA-1: c93ffb09254521dbef3170e2d785b63fa3e23ceb SHA-256: 6ca0e655076400222ba7bc27215108140f8fb69f258fde6a852a09d7409c5db3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to WordPress sites that appear to be compromised, serving as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware through these compromised sites. No scripts were extracted, and the document body was unreadable, so the analysis relies on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/9fd7dd963e561444a1edc5266bbf9e45/46606936005.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb4872eab0---dejedoduxubexawixeso.pdf
    • https://acavacecio.it/userfiles/files/52906708008.pdf
    • https://luatsuavina.com/userfiles/file/xumewiloxixuvobip.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716dad53951---wodofizurosawugarigogetej.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfb75e22f8---dagux.pdf
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4bf65c411---bibatunabepiwal.pdf
    • http://lnianemarzenie.pl/userfiles/file/sadomolibawuzitogegibe.pdf
    • https://termoformat.md/img/files/18350999386.pdf
    • http://pokemom2.com/uploads/files/musexevegebumujufiniwos.pdf
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/ad97ce1a6eff83aa45a94622c41ac58f/tegulanosam.pdf
    • http://pusancard.com/userData/board/file/24600078903.pdf
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/6bf50020d538238d7d6ab537a28ebe83/39387367646.pdf
    • http://roocenter.ru/upload/file/37708876491.pdf
    • https://jdrum-music.com/uploads/ckfiles/files/resolivepanivosenodeba.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/vpbg07v218m572b3qj42q0a8gd/jateromakepewebuvufirevev.pdf
    • http://ongxoanhdpe.vn/upload/files/70745764114.pdf
    • http://rainbowcaterers.in/userfiles/file/fuzonasovukimuvewimuj.pdf
    • http://maihome.hu/admin1/file/zafoxuga.pdf
    • http://spreewaldatelier.de/img/editor/file/pugiwegerofefabajupo.pdf
    • https://krassimirtaskov.com/userfiles/files/9435492769.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c446080d3---94441622808.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf18fb691d---vomisefavov.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070936e1a246---16909189804.pdf
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cb48f4fa4786e215a9867e472369cf2f/18239892947.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=good+free+battle+royale+games+ps4
    • 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_off0000fa9a.bin
f211d1cdc96374f43a33af9fa76a6da2aa5cd25d943d7a4d889cd00ab7819b2b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9A 11016 bytes
font_01_sfnt_off000113f1.bin
f515c889d5db9d8812d16282e5c1f1422aab297f29aefd311e458f2a41c1aabf
pdf-font-stream PDF embedded font (sfnt) at offset 0x113F1 17076 bytes
font_02_sfnt_off0001402a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1402A 16792 bytes