Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a2f3ceb7c7a87f7…

MALICIOUS

PDF

93.5 KB Created: 2021-07-17 01:19:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7dccd7005fa8d8133df4b7837e89aa5c SHA-1: 4b1c0194f047e0daa34c8643de35fc3afc950ddf SHA-256: 8a2f3ceb7c7a87f7fac9a826e07102d5942c66387e0a070a2ce495842773d9b1
196 Risk Score

Malware Insights

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

The file is a PDF that employs a social engineering lure, instructing the user to install a browser extension or update to view content. This is a common tactic for credential theft or malware installation. The PDF contains numerous links to external sites, many of which host further PDF files, suggesting a link farm or download infrastructure. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983a262e662.pdf In PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a5694081e2b---82079216069.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/6909295161.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/sarubipilovozalu.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/xagububepivagi.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607b092e05f07---29225585208.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/resugotonutesaxijug.pdfIn PDF document text
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/segajako.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/66860847856.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/qc25ebvhito7sab206ie62ak6h/20183163019.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607077923e4ff---xixusisusinupe.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b63944c3458---vadabifuzesupeburukibani.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/ff992661d69cdbf9421f321923a79ba0/95014187853.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/legab.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/45078108899.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/ccf09609ab8262188411c6e0f6b35478/vuwatesosijagitirefipolil.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/tovizupisunoro.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/efa17d872be362bf15a3e1d0b4261892/64989092746.pdfIn PDF document text
    • http://smitheaster.org/clients/861344/File/43484947315.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/083f52ef3f52731d773c165a5f15f739/93793881810.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/4e8574e32aa066e0acb4fbbceef092bb/28305403279.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/09fe335fe975024d9f3be82b84d05162/19233986720.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/pu8g7c55duahrjblm844l75n68/52150303890.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/91055616634.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8d7fb39ad4---mupujukateb.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/b431b2b8518cc18351ec24854268122c/xepofona.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+repair+corrupted+pdf+file+freePDF 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_off00010b1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1B 17608 bytes
SHA-256: 9fd50115b4a364ea0fe03d64fef539a3d189b9894a74b4e071af423975cf8ea4
font_01_sfnt_off00013875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13875 10520 bytes
SHA-256: 84a6af41b2112a24fd3d6c2aa37c08d367fba1672466295e295d15f53e3db17b
font_02_sfnt_off0001508c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1508C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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