Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c6fbd9e6f4f9223…

MALICIOUS

PDF

81.2 KB Created: 2021-09-05 05:06:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 816dda803908b67eac20d7560d0e4908 SHA-1: c523c652b5be6257b07661a20937848c547aa446 SHA-256: 9c6fbd9e6f4f9223cb0d6cf9219620d1159a2dce85a7f051f898590fea9f4cd0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://museuminiaturesbesalu.com/files/3572630820.pdf In PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/sd4h06io377egjfk6u1c6lq014/semimodosozewuresa.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/62809256001.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df32238e8d8---85857018080.pdfIn PDF document text
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/xajedurukomifata.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/161024f4d19a95---15825194353.pdfIn PDF document text
    • https://led7.ru/file/kiwojolojolifadejomoduniw.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/78768230091.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/15159179429.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/tuwizofixiwavumoje.pdfIn PDF document text
    • http://industrialdevices.in/uploads/nomumob.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/2oitgb2u90gbbtij6q3ftar0ud/tibaretapobeler.pdfIn PDF document text
    • http://thumpamonpally.com/userfiles/file/gitanixokin.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/xesalowisugobepa.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/9pnh5hl5t5srm6ocnh6lf9kgfu/jobijaxuliwot.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/72852501432.pdfIn PDF document text
    • https://service-panev.com/userfiles/40622508034.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/41784639378.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/rodiluteroxebinekofase.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/49023702484.pdfIn PDF document text
    • http://rcvizovice.cz/ckfinder/userfiles/files/98326771521.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/49799575805.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=transform+and+partial+differential+equation+pdfPDF 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_off0000d833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD833 10868 bytes
SHA-256: de9fd29ac853487be0a87d5a3f5f5096c6a9853eb680212ee67a61c3e9f5f51a
font_01_sfnt_off0000f10b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10B 17460 bytes
SHA-256: b2e9d86962217c9d3595a08ed06fbf2ba920d115d2ad37502106e18391483b56
font_02_sfnt_off00011ed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1