Malicious PDF — malware analysis report

Static analysis result for SHA-256 8069bf3ffcf30fd1…

MALICIOUS

PDF

72.7 KB Created: 2021-09-24 16:04:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e4e7891c5d848ce9a5f143b95038b2e9 SHA-1: d68119600b22b20f6e825f1e17f32843d584bebb SHA-256: 8069bf3ffcf30fd17e89bce5fe87852628eaf3da0030377370ad447f6d0882d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=how+to+find+your+downloads+on+android PDF link annotation
    • https://charteriraq.ir/basefile/charteriraqir/files/9595014164.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/77506227890.pdfIn PDF document text
    • http://medi-sen.com/files/files/32732567947.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/58711210610.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/mupiloweramowagavepizuta.pdfIn PDF document text
    • https://alutat.com/data/file/27061189363.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/54083435135.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612fabef43800---84744108063.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161394b3a15601---59576013140.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/fajivonosik.pdfIn PDF document text
    • http://orlickachata.cz/files/files/fabarone.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021092010415320.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/wopuzubasoj.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/rugupeduvafujidofu.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/76140573062.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/wamosowojaxefivurolibefar.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/93544415027.pdfIn PDF document text
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/80873470897.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/37939375845.pdfIn PDF document text
    • http://huemin.com/fckeditor/userfiles/file/13179441179.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/rutirenige.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/lofafi.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130775e8e14f---biporidatome.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/lapigibemigegugemisuboneg.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/wipusalotuf.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_off0000b6f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6F5 10508 bytes
SHA-256: f4904e27fa7851e94391e65a13ee0ac73e93402e027b4a5f57441b2af10cc6e1
font_01_sfnt_off0000cef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF3 17984 bytes
SHA-256: d0c6e9cf8623841ddbb1b40dcdba337b475217df21c7a4557d0f491fd2d66ff7
font_02_sfnt_off0000fccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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