Malicious PDF — malware analysis report

Static analysis result for SHA-256 4febc62c0ddd2d89…

MALICIOUS

PDF

72.1 KB Created: 2021-07-14 10:47:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3f03a223e528f18f0962e1927e9209e4 SHA-1: 6173715e3c15300337d1526bd4c59a7351b7bcd4 SHA-256: 4febc62c0ddd2d8948f834d8a19e17e5a4860f9fd1bb6997d553fc9f3018011f
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains. The embedded URLs are likely intended to host phishing pages or download further malicious content.

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 https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160823b9d6b5cc---3956271680.pdf In PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/jltigjs1o0oetmrk7rvbmgk19e/58159612345.pdfIn PDF document text
    • https://kopari.hu/files/file/disamuzejegomurilafodis.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/61970592298.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/rofodarekesezibobifasef.pdfIn PDF document text
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/36593820537.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946a3917b72---76705752067.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/30819007988.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/fodevo.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca696112e5---kosigirexejabunebuwoxa.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/55c99f1e940327efb2318678bbd0f25e/zufudewejokivujesalupakol.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608656709da3e---84672383949.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/nli5iqsiqijbk7bi6b1kl2njp8/josepemozanep.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/c72d8ed1d41d969649ee919a5495fff4/vepal.pdfIn PDF document text
    • http://aimic.com/userfiles/file/94609793626.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a44e7b6b4---2404129551.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608063e5e54d3---kimadeporuza.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/nuverukikoxomevib.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/53714171156.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088f7ca795f7---bomuwipigadulenigepokiji.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5744ac63c2872d5f2e1a8695b3fe7df8/vagogugovebegumogete.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16080f60834f4a---deseguxivatoganuriguj.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6c54c1c38---fafik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=take+willingly+crossword+cluePDF 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_off0000b8ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8AC 16356 bytes
SHA-256: 7dfcfc0494e34b4939a9d6e899c12bb61b3eed2797713eec3795bf643abe006e
font_01_sfnt_off0000e304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE304 10804 bytes
SHA-256: 865097542e6c75dac850ed36a7c92f413ad864e7b967043606d0535b8d018486
font_02_sfnt_off0000fbe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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