Malicious PDF — malware analysis report

Static analysis result for SHA-256 cda9f7e8f2eab63b…

MALICIOUS

PDF

87.4 KB Created: 2021-09-17 08:15:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 56b5c68de81f85d3890760ba100ff277 SHA-1: 30b905edfd869b9e7c16864a64c18f18a85c7e7a SHA-256: cda9f7e8f2eab63bffee736174633aa2f2bbe3fe0fd3c683a23ab9d2013506fb
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common technique to bypass security filters. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's part of a phishing campaign, potentially leading to further malicious downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • 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.
  • 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://jfe.hk/userfiles/9164430344.pdf In PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161367e5f26aa7---26251936893.pdfIn PDF document text
    • http://deauville.ru/files/file/95835036225.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/riremunekironiru.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/bupoxamevabepigesaled.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/wozuvopajijazazugobowa.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109090838403071.pdfIn PDF document text
    • https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/fulesofezuselog.pdfIn PDF document text
    • https://centrehistoriquesndbc.com/ckfinder/userfiles/files/53604678884.pdfIn PDF document text
    • http://www.focitabor.hu/userfiles/file/86107408736.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/28600081430.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c65a356b6a---bugusezaduboxibinelola.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/47153723973.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354de99d0e4---novapax.pdfIn PDF document text
    • https://jager-ig.tw/up_photo/file/xodaker.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/27793547916.pdfIn PDF document text
    • http://artepcb.com/upload/files/serizevodabudisoma.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/kawodowawuki.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/zeletegu.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/lupimaleragifavifiwiz.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/97513902899.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/sumaram.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/89759966727.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=pokemon+mystery+dungeon+rom+hack+dsPDF link annotation
    • https://easyown.ddproperty.com/datas/files/wodaxoxusavawopal.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_off0000ec1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1D 10988 bytes
SHA-256: 522add5f1d628d59cef273e630e4a3364256c262827928d16f9c358c57a2cbcf
font_01_sfnt_off00010550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10550 19620 bytes
SHA-256: 1c34a078d5c07b52c9524497af6e9fb6dc3f0d4024f06f27caac0731974f9cd6
font_02_sfnt_off00013873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13873 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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