Malicious PDF — malware analysis report

Static analysis result for SHA-256 10540efcd7eaaab9…

MALICIOUS

PDF

90.6 KB Created: 2021-07-27 18:31:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7601d72418601e378432112a9792f75d SHA-1: cf1183c9186b84c21fe3113b40727a5c8aac9d76 SHA-256: 10540efcd7eaaab98591f3c9a7fedb0a4da55a10e14ba23cc2d19ddc55f4668a
196 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 indicate the PDF acts as a link farm, directing users to multiple compromised websites and potentially disposable hosting. The presence of 'cmdct60or5tliea/wipalupapozenumuwuwup.pdf' in the document text suggests an attempt to disguise malicious URLs or commands.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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 http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071698f150b4---63640361874.pdf In PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/9f3a32277ba86cee0786f03fccba8d54/40819084785.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/40657809487.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/32140257275.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ad97cf18b56---11148046326.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/5n97g6kgo9ccmdct60or5tliea/wipalupapozenumuwuwup.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/45772452877.pdfIn PDF document text
    • http://soflocops.com/clients/67403/File/30030378545.pdfIn macro / runtime command snippet
    • http://boxethai38.com/upload/file/nobuwuvizisimu.pdfIn macro / runtime command snippet
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/tnegq17555ugti9cje0fdgkpt3/67984305977.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/12v24ur71i0h7hhai2pm8nk02l/36885345135.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/dae113085714afbaee7dcdb4e0e4a2c8/45639884095.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/1632641402.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/0aca3a157d21e4a4cc58d46f191eb314/31317047052.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/80377492068.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/223c73f405156e8e24840111075995df/depezebemibekimix.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8b327973d---nisasavilopo.pdfIn PDF document text
    • https://juegosinflablesarizona.com/files/58889950759.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b976695a5b---57250323794.pdfIn PDF document text
    • http://mesterek.net/tmp/kesugamonelepelugawen.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b91f76bb7---7936755882.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/0gvsqe6h5kg4riemp17hbuvle0/81774602176.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/84c948477d3f352ea12a2207a879a423/29326817719.pdfIn PDF document text
    • http://donghozibisIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+reset+a+maytag+centennial+commercial+technology+washerPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f30d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30D 10868 bytes
SHA-256: ec57bb767c67bdc322d69eb03abb49176ef62d67fe38e6534c4c7d0817c79b0d
font_01_sfnt_off00010c0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12418 2520 bytes
SHA-256: cfa7383a041ed23d7e558c55f2d24459f64203f41db2081dca9fa426791aea74
font_03_sfnt_off00012efe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EFE 16992 bytes
SHA-256: ab1512b4419d0986a6b81860e518f01fe63e66e4a27c373e736a4c9ea5e55e86

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