Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa5d1bca62978fce…

MALICIOUS

PDF

299.0 KB Created: 2021-08-02 00:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f6df68fc8370772d03b0c70639c73cc2 SHA-1: a3fe19970698219c7c499436248481563e2eb812 SHA-256: fa5d1bca62978fce1c82717e645f3087d960643b1a7954583cbcc7d2ebc360d7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely attempts to redirect the user to one of the numerous external URLs, which are hosted on compromised websites, to download further payloads or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8709

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=free+movie+wav+files+sound+effects PDF link annotation
    • https://edu-mate.kr/_UploadFile/Images/file/15873328810.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/sadapagerujegusujewatun.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/512b46133a5ee51a56549a96e3b45ff8/rilaraditujodon.pdfIn PDF document text
    • https://blogsma.com/files/rokagogiregiminadedavup.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/65b151663ca761a46dbd7f068a65b8ea/pazomediwokivatugepuroru.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/tozajokox.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160890c1668c54---87889115596.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/35829716129.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16106b80358343---85090757854.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/18450d036fc6c9886fb3fef9ec8964b1/64424138324.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/pebuzexobujo.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210714031714_j1hwce.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/72bd376b97cd3faa348dc76f0b9a31ff/dezeworugomezes.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/k4ifnhbp3nucnmhg1fal54sv6r/dofutofowipituvojuweviwa.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/wibowojewuvokugi.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/b549f3edccac2cef648f9aac9d48bbdd/kenobarafexafizafunat.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/wulaxikirajegudadiga.pdfIn PDF document text
    • http://cathayred-csr.com/img-cathay/files/limukikirosuxanewawobu.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/xijizitosanofezoposevuxor.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/20601811858.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160da347e1fe48---dodapifesonamoletodumifim.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/wogofilewuzadew.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/5f3b7f87f02d271f2d6db0079ae7cf14/satuditupupomowa.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000421d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x421D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000439e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x439E8 21108 bytes
SHA-256: 980661bbcb0433bc21df75f8dd249477cca9be561aa6357ebb74ff898803c637
font_02_sfnt_off00046d79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x46D79 10864 bytes
SHA-256: ec0e0ab71094ce785a30702e9682d14339d8fb52af8456f5820a78a9bb01f931
font_03_sfnt_off0004869c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4869C 16232 bytes
SHA-256: bf3ac2bbc5511ca59b022801f68684aa2b8ae7661b1a55c6866fed5ae8d27d0d

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