Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b63cecd50d018ef…

MALICIOUS

PDF

94.5 KB Created: 2021-06-25 18:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: be7da3ba18e6b0de0d32c6dcebff0b6f SHA-1: d32562925dc24ed4be98804cf1c3737023646487 SHA-256: 3b63cecd50d018ef2c078a5b93925a5c594ef06e423305ed18805a4c8cfe7984
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple compromised websites and disposable hosting. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/4a2bd67cb13ab519be2fd965b5742e4f/rajugubixuxonajiwojepob.pdf In PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c56abdd5e1d---5204685856.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/bikapagivomogeleguzajoba.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/gg5rdlteqb5hlis373l15vnvpc/xetopo.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/p728kqo9gkq0umitk18q9kinei/gevidokugotejefu.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/67133136773.pdfIn PDF document text
    • http://www.kilincsweb.hu/fileok/file/36823079195.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16075a87132508---30828221555.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/bad0c50af9803def4962bcb83c3c9b7c/47696910366.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607394e5d1d60---3689819711.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/duk9483hh105fm4p2j5sqhuk8a/83324804957.pdfIn PDF document text
    • https://corghialberti.it/file/vedemepewugefokegamefo.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cb947d7c17a---62077075300.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/kepol.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/36959787796.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/6cc48a0c916e73edf6319fb908982c56/66716178912.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/60199965082.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/430af2250604b9f31a692cd58266f8d7/66561087436.pdfIn PDF document text
    • https://combrooncom.com/contents//files/xijumojurobusiwolosuxemi.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/12084773005.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16078313b9e553---82885581250.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160728d61934e5---girorupikixomokafoxavonu.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/5e11dd2620df51e43acbeb54f37486be/28988701194.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e2f088f31---dakekokazuvosubemomamebuz.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/4b30517c2a85ace8e7fff6594b3fd0fa/maxaledolenitadovejari.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=monster+hunter+pure+dragon+bloodPDF 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_off00010eb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB5 10812 bytes
SHA-256: 4454b57d11fb4b9403c5ed6075bceb478ed3c6b33b728c29e4157ed2afb7cdc1
font_01_sfnt_off00012726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12726 17416 bytes
SHA-256: 729987461e8f1ca20a0712dc671de3b08199592f017ac944ee2692368cee075b
font_02_sfnt_off000154c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1