Malicious PDF — malware analysis report

Static analysis result for SHA-256 d56edf73512b661b…

MALICIOUS

PDF

91.8 KB Created: 2021-07-14 03:25:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: cedcf2125d74c0d30b287ff78ee493c6 SHA-1: 6c919e9374537179430189139d243bdd36d211bc SHA-256: d56edf73512b661b0542e8775488239b6f601848cb4e2c42fefc7bd58e728c3e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier strongly indicated maliciousness, and the overall structure suggests the document is intended to redirect users to potentially harmful content or exploit kits. No scripts were extracted, but the link farm behavior is a common tactic for distributing malware or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 5

  • 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://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1606c95cb6d979---sogekimosimegob.pdf In PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/d7023bff861cb01915e15cf0a83a75a7/merutilefujusiziviwixatem.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/76c57efd94d1b175d3b11cff0f436b3f/20371112162.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/7195188395.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/bogefoze.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/e0f28420bcac807f6b39f70bf17a6b94/marolofigojonid.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/mtr5ar424fuolvcuuv8calm86k/71967611508.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/cb3b87eb142421c716019be24ed97f30/binubufibinerabaromojanaz.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca2d54c4c8---3438087353.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/vapugilal.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/0ea2f280ee20a9c9de52b831be5bdee9/57577249126.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cdd28877a5---jevujaxor.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c24123cd548---98953586973.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/16107696716.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/fef4be6ba8f06c2b55bd3f487baa9ca0/45409860511.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/74c4df785761d7b8f8e00bb93f236d58/vikafuboguvuxenuru.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/qq8jfjgs9l36a54u18bf405tf8/dadipavigodanugudewifen.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160ce323d510ec---82695044709.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/fukuxuratibatorij.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/xagelawurajoxuwizuzag.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/02fd9b906c633a02d7b19b8873813598/53316392481.pdfIn PDF document text
    • http://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/rokuwaxabizizaja.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/0j7112o74gv0eca4ck7l69mfcs/87109289273.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b2aeef5b8f2---90514800521.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/98827404377.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=tab+player+onlinePDF link annotation
    • 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_off0001051a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051A 17436 bytes
SHA-256: 69b8831ec9782bd608fa14a4c74c1cb786c41c4424fe5c4a96b52627dda61b16
font_01_sfnt_off00013306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13306 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014b1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B1D 10196 bytes
SHA-256: 07770d0613dd111fbde54d1cb4fcde85c494473d88e7d470ab804dbe1f4324c2

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