Malicious PDF — malware analysis report

Static analysis result for SHA-256 673d146277a06791…

MALICIOUS

PDF

83.1 KB Created: 2021-06-28 23:20:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ae9a8be63b37d35fffc7998651b11e0f SHA-1: 2d641bee283bd42822c6cfeef622b76bc23581f2 SHA-256: 673d146277a06791c9e10040124aa23d503dc1dc714746e20ebba882c4e6bed8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • 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 http://1982thsreunion.com/clients/a/a8/a85c6617a93da1462bf6c3e7dda9c043/File/gerumarivonovinug.pdf In PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/8527c2f6137303deeb836116fd8a8ab5/rifagodewutawofedad.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/vasures.pdfIn PDF document text
    • https://tempatpasang.com/contents//files/xixugogipupusus.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/1e66aa1a13830b2c01c0b5e71b766e65/zafitetokagovovisobowu.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/6523bb3651dbe2c92b9dbff4bf19d35f/bemem.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/83848531786.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1ebe7131e---pesixuwobifazuwoxurag.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/xojonumafobebebenanutazes.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/18087785819.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/pr63ifh4quc5vfjaoku879ugh2/womidikozonakezezoxo.pdfIn PDF document text
    • https://bataretak.com/img/files/file/petalareniwesojuwegedal.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/58982714057.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/55807173954.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/mujel.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/79526661447.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160804002964fe---15809765974.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ccdd4b8179---woxebuvisezo.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a192586863d---57645809418.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/wasawogikur.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/89340796136.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/xevexovawisobufitetafewid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=three+and+two+tenths+in+decimal+formPDF 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_off0000de8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f69e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69E 17900 bytes
SHA-256: 7f93932071206e5341440bae9a730916eb28ded756283094639e05a0dd876787
font_02_sfnt_off000124c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C1 10792 bytes
SHA-256: 4ba3622f2e5ad509ec95f893fb44520452638b5798b65ae362a274c84ab04a15