Malicious PDF — malware analysis report

Static analysis result for SHA-256 27ff0d7a284cff37…

MALICIOUS

PDF

92.9 KB Created: 2021-06-28 01:17:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 2b1986bd808e6e575b91b14fd5c9a7e4 SHA-1: c32b1fdf42594651617dfc2f012947870f587517 SHA-256: 27ff0d7a284cff3774a9376b7db6229bfe9eeebb8d35033b795111b770b6e51a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to other PDFs hosted on compromised or disposable websites, indicating a link farm designed to distribute malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification strongly suggest malicious intent, likely involving phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/2f602ada2383af360ad6c1a8daa95cc0/wesudixoguri.pdf In PDF document text
    • https://tvsporedi.si/vsebina/nalufaruxuse.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/92117930964.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608a68551f07a---86268318985.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/60215823629.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/59410348303.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607018abccaf4---bubidexavaso.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/3185332511.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/rorux.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609b52e0d62f3---zipugibewo.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/42ce0ib44419jmtcph6nugqau8/mitel.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a70210b04---feledudiwiwifanovo.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ad92801a4e1---vafosukokutodaxusewo.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/pofige.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/e7ede1a389c19da6253a8c9f1589e4cf/47967363772.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16081d33c6a5b8---77167940258.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/c35bfa99c13d84b6f908d0906ab6caf9/gipireni.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc893405dc---sivamefagi.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ad94c9c2f8c---44489066709.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a896fce7983---78432443395.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/7921dffc6ffe11895ecea8bd833a8830/74723828266.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160762409a7fac---novinovavi.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/rjlsct6ljem83h7ft9vhmnimap/94180804646.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/4cdf162a90c43ee7b979434d8b2f0183/37391550622.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/8f4m261q263l34obuv1eg7kb09/19058650319.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=class+6+science+chapter+3+mcq+with+answersPDF 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_off00010823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10823 17004 bytes
SHA-256: 9448e862898d9142ae1d748af6b3d5ae9c4e42bddb54b8f4e7e003e1748c5f10
font_01_sfnt_off00013444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13444 11120 bytes
SHA-256: 481ef99ca50930652003d10820ef7d9d7a108636df1b0f0f5946bac65b24a870
font_02_sfnt_off00014e18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1