Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a93f76358720a3b…

MALICIOUS

PDF

92.8 KB Created: 2021-08-27 05:16:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 536787bbaf37da284d30a79d3cdc986d SHA-1: e170b97b442e4777278e63c9ad728dc742fb7e74 SHA-256: 9a93f76358720a3bbac8a96d85ccb1333348d5dd10d56ce9cad582b598b6806f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. The document body is heavily obfuscated, but the presence of embedded URLs and the overall structure suggest an attempt to redirect users to external, potentially malicious, sites. No scripts were extracted, but the PDF structure itself is leveraged for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/156f1edce09175cf13baf769818cdbef/gababirixomaxuda.pdf In PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/vobiw.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771781428e2---nepupotakidapow.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/zebuboritazevi.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/d34a3041337b98e69362d4f49acafced/75928253232.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c6bf6841a78---18737039313.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/lavevidepewuz.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/jagaxutaz.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/79399532432.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/81411695879.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fb4378615---44343127779.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/dogolufisunoboweja.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/53878245336.pdfIn PDF document text
    • https://dannysacademy.com/ckfinder/userfiles/files/pefipevowubezuwewidaw.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/20384b641f5d77912cb4e2ec9aa4ba10/17913748070.pdfIn PDF document text
    • http://partnercable.hu/files/terijijigala.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210428114455186.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/88920084048.pdfIn PDF document text
    • https://samowar.me/upload/file/88042139114.pdfIn PDF document text
    • https://purefeeling8.com/data/file/158127521.pdfIn PDF document text
    • http://furmanreunion2021.com/clients/3/37/3732e4fa3878e851f9d164dff32a9cbb/File/vefiforapaf.pdfIn PDF document text
    • http://abpaluso.com/upload/file/78014139077.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/lqao9hr9cc913mcs4khc7o0a82/zexipevesexaxituj.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/25890519532.pdfIn PDF document text
    • http://eksternest.be/images/file/gevetututet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=parlay+in+betting+definitionPDF 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_off00010695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10695 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAC 10616 bytes
SHA-256: 9c70f170fbdccddcb27150ec49549c943e88bc61f5121d9ba8a8df7347098ca1
font_02_sfnt_off000136d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136D3 17364 bytes
SHA-256: 18d46d748501d8c6cf63ed44379d56600a8de5263102b144cf6261d36fd6a82a

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