Malicious PDF — malware analysis report

Static analysis result for SHA-256 8853109e91daa4ff…

MALICIOUS

PDF

96.5 KB Created: 2021-09-05 19:23:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8e1f6f337c0c43c4697754ba2066444c SHA-1: e28b7d6041eee60819421de04f81b1bf25f61ff1 SHA-256: 8853109e91daa4ff94d4b5e6e32a876d8e6e55fc2aae6e0cd8f56f3b9021e33a
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The document body is heavily obfuscated and does not provide direct clues to its purpose beyond its structure as a PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://silverstonedevelopments.com/ckfinder/userfiles/files/javivilovasomeresanisa.pdf In PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/95274410514.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c510e294d---9596224165.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/wedoz.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/monepiwufujaxenasig.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/00c1139b1ffccc1ff66011689f78076f/jafigatapo.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/33945851420.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/40122153407.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16078881cd9f2d---41856996782.pdfIn PDF document text
    • https://discovery99.com/userfiles/file/lazavutemunawa.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/14111671179.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/7042a004fd8c36ce06df4d58ffdb9cb1/24717663028.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/309f4b84c97be2c14480f52a9c5b2315/49554274883.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/kisobatufisakepufazupegov.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/f3f9186416d3b7212357a9a1bd42a98d/zudipalufajazekaberekuwi.pdfIn PDF document text
    • http://sivam.pl/files/file/mesebaze.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/84753778d5673d1e5bd910d148685040/nuzijudegimotilusato.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-7-10/20210710091517497931.pdfIn PDF document text
    • http://srlamn.com/clients/0/00/00e84243199fd86ca7c15d66a0237eb0/File/sobulodixiruguredinov.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/gjgpu5eoqcseahghfein6be0nc/tibewotutumo.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/6c71a4579fe36d791b229dafbbad724c/pidenexegelowu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=pdf+stories+of+the+prophets+ibn+kathirPDF 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_off00011454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11454 10780 bytes
SHA-256: adf54ca894d4303f0846fa802d080dd2ca0959afb37bdb3f9827ac125538688d
font_01_sfnt_off00012cda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CDA 18448 bytes
SHA-256: a1db813ecf6d5b12691884eb5a116db5b354fd6657f933174324788371de46aa
font_02_sfnt_off00015c85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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