Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9c52642e5270c73…

MALICIOUS

PDF

73.9 KB Created: 2021-09-26 19:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 43933bd23a40bf17f7140ce7755cea93 SHA-1: 74751b535364e76e286003fc655d344e45605596 SHA-256: d9c52642e5270c736b38323529375e0f2a6dbd925863859c9d017bb4148cf634
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The document also features a large number of external links, many hosted on compromised websites or disposable domains, suggesting a phishing or credential harvesting campaign. The embedded JavaScript likely serves to redirect the user or download additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://smidgel.ru/uplcv?utm_term=reset+android+settings PDF link annotation
    • https://zlato-eu.cz/upload/files/menozewokepuselagufukez.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/wenomezajur.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/45905105778.pdfIn PDF document text
    • http://stylekd.ru/files/wuxejifekedodibobobewixij.pdfIn PDF document text
    • http://wenxuezj.com/images/File/zafir.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/rusajumita.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/28677180853.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/65517650545.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/kavajobulonewugipidad.pdfIn PDF document text
    • http://domosplast.hu/files/file/18391572867.pdfIn PDF document text
    • http://boxethai38.com/upload/file/wexosab.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/24821502367.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/84c05f56e8d1b21beb3b38cb947a8db4/65616739133.pdfIn PDF document text
    • http://asesoriazabalburu.org/azaba/files/file/85577402951.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614163f75fb6e---sevidajalabavob.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/fomiroluwajasu.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/66020997092.pdfIn PDF document text
    • http://manuale.aziendasulweb.it/userfiles/files/sipixasamisupumudepozop.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/jejudepulupalapilonetelut.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/d3281610ea0baeb3bd928cb497f42887/vovafigativuxoxedaferuses.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/mifipowefovaxo.pdfIn PDF document text
    • http://bourgogne.annuaire-regional.com/ckfinder/userfiles/files/67573446457.pdfIn PDF document text
    • http://www.catedralirodahaz.hu/data/editorfile/fafozorowasufinure.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/94407967550.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000badf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBADF 10420 bytes
SHA-256: 1101fcce5eac9cbf25f629545e322f691075ea49e85630571ee3208707087cda
font_01_sfnt_off0000d269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD269 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7B 18328 bytes
SHA-256: 7598431c96e6237f41270219567af44aa39f7edf960d1637b613176c9898e5e8

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