Malicious PDF — malware analysis report

Static analysis result for SHA-256 f79e266f13022227…

MALICIOUS

PDF

105.0 KB Created: 2021-09-06 02:31:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dfc231696442a9b305fe1a4dceb05910 SHA-1: e4a8b1c86013afffe706f76d6d484c745f6532c4 SHA-256: f79e266f13022227ff4ead44af99bc02349762f2cf53ca6d7665c0dc252ad52a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of numerous unknown URLs suggests an attempt to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/e063a1718d509ead134fe0e061f7902c/xelomevemaxujazazas.pdf In PDF document text
    • http://capmar.eu/userfiles/file/mupafuzunat.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/5309559323.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/2b2568cdc147b804c3f6a4d00f079c1a/gabezamepunerevaj.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/38157163182.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/34662217008.pdfIn PDF document text
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/koxikateb.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b28702706dd---88181500789.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e6e81b9e95---70312923388.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/c7ea59c655b8970055580c3a43559508/gapesugowegomazepid.pdfIn PDF document text
    • https://www.micd.edu.np/ckfinder/userfiles/files/12109431659.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/limolasatal.pdfIn PDF document text
    • https://sanxuattrucauthangkinh.com/Images_upload/files/69974273413.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/maxafawuku.pdfIn PDF document text
    • http://k9careclinic.in/ckeditor/ckfinder/userfiles/files/69943590288.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/31911711575.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/nolabaxipaj.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce3d1db8b6---87854841016.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/nelawavob.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16099a7075f69b---guwefirovaxafudaz.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/4ee162595ab8a34ab5af3e407ab9a6b8/refekan.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/n68jali1htk9s05mvtmg4cgi2q/18053577971.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/25634066109.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=manual+windows+10+1809+updatePDF 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_off000118ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118BA 19260 bytes
SHA-256: 6750df2c9c7bb7b3f484ccde9645945b3b215abdfbeedd9612c3d5a0c980dcf1
font_01_sfnt_off00014a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A1D 11012 bytes
SHA-256: 26d3b5649ddbda0c566310e7b99263e9c5d074c412ea63e578f2df7a14c3f8c5
font_02_sfnt_off000163dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163DC 17412 bytes
SHA-256: 19976088aad254a241317a8517a014f227c6e92c48cab75069fe505244f72ebd
font_03_sfnt_off00017dba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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