Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e816f68ff5298e0…

MALICIOUS

PDF

85.0 KB Created: 2021-09-05 17:34:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5b942bde3f6fa5355b50bfaea354e714 SHA-1: 7e7de180f57a250bf1816e67a12c234b5469844d SHA-256: 7e816f68ff5298e0798906d3101c2959e3fcbcdcaacda262aa2085ac691a52d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or redirection mechanism. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, but the presence of external links and the high confidence verdict indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/84763548787.pdf In PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/xedebesilegirig.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/faf6eb8dee129641bf306122616d5a41/digimakorox.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff00f66ff6---8369573539.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/gewiseluxojitukulukirar.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/gerejudoxulixepekej.pdfIn PDF document text
    • http://slp70.com/clients/873855/File/16474108460.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c8eda862af6---65760954600.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/12392368506.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c90316022e2---57115821647.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/revosukiruzuj.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/v9e3qvaor45d7p9cgu9mf6mleg/97137479024.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca1276c2b5---fusawiberusozasamudewaso.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b58d9e43458---57818120759.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/dddde250949b564163eab0469eae4399/84358106519.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/soluzazomarokosanojunoj.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869240c77c9---72872061867.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/32306622920.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/wirabaruxuxamesisopakawi.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/12584394260.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/pugevufiwavipeles.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/26538180372.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=abbott+alinity+user+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_off0000e75e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF75 10604 bytes
SHA-256: 1615e10b3e1462c63011718b5d9b1bb11aa3b4ea6cc5484c0f899991aae96310
font_02_sfnt_off000117b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B8 17888 bytes
SHA-256: 5eb476cdfe9df8d77b15569e9bbe3d008e755772fcd8c13e6f006edb370fd02b

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