Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb6b2a6ef13a7598…

MALICIOUS

PDF

85.7 KB Created: 2021-09-07 15:57:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 744c79349b46b47904f43c25a66dd74e SHA-1: 60e38092cfdf7c036ad14c3a2e603b4baf02aeae SHA-256: cb6b2a6ef13a75988003b6d8e15f5cd48ffa1993c79688ef8e085b7927c1ba60
204 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which are hosted on potentially compromised or disposable domains, suggesting a link farm for phishing or malware distribution. The presence of a 'download button' lure and instructions for a password-protected archive strongly indicate an attempt to trick the user into downloading a malicious payload. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.vandiestbrandstoffen.be/uploads/files/metumeniv.pdf In PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/4321024054.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/pojelabujelanibugamap.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/vugvekegajipnuh1itnej9dgr3/71831411045.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2305aa4b4---25706096614.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/wowirumaluxatusifozu.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/46fa0d47a714b322ccd92070ce2ac277/57739138186.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///67174987217.pdfIn PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/xipategisuguxevaxagaxukid.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210803034256_868927940.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/82329990219.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e97d3a1a5bd---17731947640.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f9af2ebc5f4---86040369866.pdfIn PDF document text
    • https://afayl.com/userfiles/file/noguluromurolerelogepav.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a086945243a---59751153462.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160a14297820a3---2749792856.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210605105009.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/62300462569.pdfIn PDF document text
    • http://pvhs1967.com/clients/a/aa/aa78cb05297cd93d8a9ab6bd1eb8a3c4/File/vofobujekiverebip.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/ripakes.pdfIn PDF document text
    • http://hanleyresources.com/images/16571499604.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e56ac4643c---74335580929.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=nissan+tiida+2007+hatchback+manualPDF 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_off0000e9b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B6 17628 bytes
SHA-256: 49f28ce84213878879e590a6c888b441986eb424e2a25122513af84a082c6b4f
font_01_sfnt_off000117ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AB 10884 bytes
SHA-256: 039c29dc36a398f640d73539622cd13744307ddfc2572cfb4c07451373665854
font_02_sfnt_off000130bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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