Malicious PDF — malware analysis report

Static analysis result for SHA-256 6863e613286bfd49…

MALICIOUS

PDF

72.9 KB Created: 2021-09-04 12:25:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 757a5f2c4924d76d087746d380e70e9f SHA-1: 1cc63e4287c85f04ad65445aafbc2a51d7ef200b SHA-256: 6863e613286bfd4958857e7a4d227f8f8f6a87c20c0b33dba017281874619a45
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and ML classifier indicated high maliciousness. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kazoxowigowumusoti.pdf In PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/ripegezu.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160792918eea34---17389180651.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/zoporerawuda.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/hs1kcf8tj0e8ldrjk3fn63g538/89938129615.pdfIn PDF document text
    • http://stlukesmn.org/clients/17773/File/66506165260.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/81170213974.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2efc0e5bfe---nelawimug.pdfIn PDF document text
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/80996663053.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/qm075ihq44v3uhcbgp14t380o2/29189125943.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a05d2d5b5e---59102970464.pdfIn PDF document text
    • http://mrybalko.ru/files/zofixomabufuzeruzupo.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e648b2625be---xesodagunevifedo.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/97141454031.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/98rkhntj3l6p9d7ieb48bk8g26/fadonumunefuxaga.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/73286334118.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/21818512619.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/bapigemewanenes.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/newusevupurosafumemizaso.pdfIn PDF document text
    • http://hardiebase.com/uploads/assets/filefile/pototadosetibugovemo.pdfIn PDF document text
    • http://luatsugiadinhviet.com/upload/ck/files/forodepobin.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/63a86ccfe4659f2be7bdb84845ba986c/jorusomex.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/83022969295.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=cubic+system+pdfPDF 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_off0000bb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB21 16748 bytes
SHA-256: 29927a1b7e680a386854c7d59cd2dbd8bfe0708d4a02c563e1b38be4aaa4b70c
font_01_sfnt_off0000e60d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60D 10632 bytes
SHA-256: 4212eb6934a16e542e423b27e65c2fcac5ecfbbf678311f24ca24e005ca65298
font_02_sfnt_off0000fe49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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