Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b3e46588bcaaad2…

MALICIOUS

PDF

89.3 KB Created: 2021-07-01 15:27:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: a779fa39b46bf7434c072bb1b8b80fcc SHA-1: abeafb93f600022a5dfe51c45024cac6911a4a06 SHA-256: 2b3e46588bcaaad2f22994caaa0cd545523c6f431b9e178e9c9e48f6dcadb14a
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or SEO manipulation scheme. It functions as a link farm, containing numerous URLs pointing to various domains, some of which appear to be compromised or disposable hosting. The primary goal seems to be directing traffic to these sites, potentially for malicious advertising or to host phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://aodaixuan.vn/app/webroot/upload/image/files/54924285450.pdf In PDF document text
    • https://flyags.com/editorResources/file///59819229227.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/88274451343.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddfdf7511d---12675925341.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160acfba9711fb---70365385339.pdfIn PDF document text
    • http://bethelhanberryaaa.com/clients/2/24/2465ef4bb9bb1b7382310ae17d7cafeb/File/89425111126.pdfIn PDF document text
    • http://fitviewer.biz/files/file/mimasesile.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/c1866bd94de9d91fcb5667dcd2ced1c5/35406280797.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/aec4f7d13b3a1b0104ad0d721e01118b/41663684864.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/hqpba1bt5e19psh1iiepll440r/18981048566.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/3233f484f6cc03fc5a2cd43c77059e10/19578807184.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/b068409b10a14895d087bfa7328594dd/lokixozenewevanafawaza.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/20960839880.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/67de0b42f69c3b399ccaace7e2be3fb1/sajebexitevolilikinurufe.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/vosukavevotomazewu.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d46ba059dbb---xolazatizawifujewegez.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/zavasonikimagan.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/b68b42808ee4fa9679a357d53e0d132a/tebakeweneb.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899cfadfb45---84077838829.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/1edc7f51c508e11caedfb98c39dfa8e1/43476088065.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/91692305613.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/dibeto.pdfIn PDF document text
    • https://sp-pir.ru/wp-content/plugins/super-forms/uploads/php/files/094e3f800d7223000d90c924f873565f/womekavafebim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=present+perfect+simple+usePDF 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_off0000f79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79E 18596 bytes
SHA-256: 9af91d7255cfc8fd023cb29b777821b399b575f563b29efa41147ad8747d0474
font_01_sfnt_off00012821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12821 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14038 10460 bytes
SHA-256: a3559c578e16de46278d74111fcfa77e1e65d81246f2032d6e9a6f2fcca856cb

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