Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9ae682058339916…

MALICIOUS

PDF

179.9 KB Created: 2021-06-26 15:05:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f81cf4c9cb66cc1bffde124d52b0742e SHA-1: 343f6d91290c42c27d60192aa39d1de9ddb8c9ff SHA-256: c9ae682058339916d3157f4f61e3ef849cf05392fc602fe59694aa9c76d2f838
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains numerous embedded URLs that point to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of these links suggests an attempt to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://allytemp.ru/uplcv?utm_term=brainstorming+assume+you+are+a+mineralogist PDF link annotation
    • http://goergenpainting.com/clients/0/0d/0d1038892961fdbf96b6a8e7e8daca8f/File/58758732535.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/57d95ee6e97d1af162898345baf7dc20/mavirakagatiguzan.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/jinulisuvavasaxatofup.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/ebadf3bcb97b7612e48f8d07c661a698/sajufunuruxi.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/d0af4c83a206d2d09da85ab19164653b/6282435829.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210624_91C8C09EAC69081E.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/cb581eecb858a71c9bed15c22318a0a6/17985050015.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2d00e6751---39957070137.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ff820dab1---noderevevo.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/l5nao8cjo234shqv4le01a00pl/jelusos.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/87f6cb6e6fe4cf4eaf8c2eb9720e8b15/55372265421.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/73ee2df16b82e11ade19220e49ac03ae/996267948.pdfIn PDF document text
    • http://lueckerreunion2020.com/clients/e/eb/eba09433058400eda594a485f9004317/File/kesevonevekeves.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/33513071365.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/18407431040.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/n5tt01m4rte8dl8di81s0aocl6/31106164033.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a035fc2e018---voberasu.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/nimunolojojivake.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/3uoulmskhua0p3930dnjfe5q57/50175664375.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/zifanakututi.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f0e3c4548---nelewolipelabejij.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/7vid9ibpdc2cg6j1nkdd45hg7p/liwipefelibimurinazuxanu.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/5a82b53c051bfc66b300021a57369ff7/lijobufiwazata.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_off000261a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x261A4 10720 bytes
SHA-256: 22160bd2fb5d7380dea941f22b5df500dc81509914996917880852215f5d553e
font_01_sfnt_off00027a4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27A4E 18208 bytes
SHA-256: d46244361d47de5c4c2234a4d860af4a1cac7762220ac7773d8a9795314cd15a
font_02_sfnt_off0002a9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A9AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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