Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f5b70c67c913057…

MALICIOUS

PDF

90.7 KB Created: 2021-07-02 12:17:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 09d72e9701e4c104080c06ca8721ee6a SHA-1: 08e9cf246333eee7fad67ba249fdd924c5b99690 SHA-256: 5f5b70c67c9130571b05f89571185e646f2d7579f46200c478981141b1a59397
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host a deceptive link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 6

  • 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.
  • 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://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/720e6b13f749a0f15f7e1d98efff73b0/76759961507.pdf
    • http://ceresasrl.it/userfiles/files/26034650059.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/38fa5e379952831656d682b5d49080cf/gefelaximefawip.pdf
    • https://ceccargiurgiu.ro/userfiles/file/8244977498.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/a4vvs4h64f4788a8f4oi0lrgep/46325002647.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/5tv6s6vau16em51bpq3a29dk77/28238385322.pdf
    • http://domeinbeverdonk.be/assets/files/file/pevixokadizudojuxexorofa.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087c26bceb29---5769506638.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/klu982c2ddo69vc1tqh9u1s515/kizafigezesenisivukati.pdf
    • http://circuitoinsulargc.com/documentos/file/ralufat.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c56a98b62---97473148918.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160725914c0809---33200485508.pdf
    • https://semagro-msw.ru/pics/images/file/gonutobariromiwugokazid.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608825bdbbb64---tiralofupabagefivo.pdf
    • http://aarogyamedico.com/userfiles/file/puvuvil.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd4abb6748---1577349593.pdf
    • http://csc0535.com/userfiles/file/20210622175923_oggovt.pdf
    • http://vtaky.sk/media/file/92108613657.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/75l126u5fg3fqq2bac4udd8dtd/nixunafazivafa.pdf
    • https://atlastoursntravels.com/userfiles/file/76584046738.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af7b340e106---18104593100.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/c7f7f337f7181d76dd445e06aeae9a1b/25207397016.pdf
    • http://alexanderjamesbackcatalogue.com/userfiles/file/60482035497.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/bbu20gbh1dmps55palc156otm2/venedemexekajamude.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=act+74f+answers
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f508.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF508 16792 bytes
font_01_sfnt_off00010d1f.bin
6ff7e37547193f68f1734e2649b160e4201600a0f85bfb1beccb26fd70cb4e1a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1F 10268 bytes
font_02_sfnt_off00012489.bin
917b90ace2c916833cb7f95a3999243516ad94be3bea32afde56f7740549ee68
pdf-font-stream PDF embedded font (sfnt) at offset 0x12489 18460 bytes
font_03_sfnt_off000154eb.bin
6df00093d1a1fd8b8f95901b42ba2863538c90606311dd4adf1993a433792d13
pdf-font-stream PDF embedded font (sfnt) at offset 0x154EB 1692 bytes