Malicious PDF — malware analysis report

Static analysis result for SHA-256 b759b66a039f26d5…

MALICIOUS

PDF

113.1 KB Created: 2021-09-02 07:16:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f7b1132ff8e4f9d6059a71a64b98bcd1 SHA-1: 11ea5b819f3f51157cf2dcc1f0deaa28e49d8cf9 SHA-256: b759b66a039f26d5f7f9fcbc5ea1e52f949c0bd5c2b8d38b1a3a9761452eb0c2
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting users to malicious content. The file's structure and link farm behavior align with techniques used to distribute malware or conduct phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://kystop.com/wp-content/plugins/super-forms/uploads/php/files/bc4aobkikj2fchfb2qo10rl473/fogumipenulonewegif.pdf In PDF document text
    • http://ipmarketing.net/userfiles/file/66472642341.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/18f42b92a2d975e1ff23b02e39d196bc/kepudebagemepitidukip.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/gaxurekukagebiralexoke.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1630101341.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/59680466358.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/zomasanujulowasafoma.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/63044832352.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/wejufawudejekalomuviseza.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16089b53f33cd9---54823872325.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c206008ce74---bukazutogozikasepomabuf.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/32530926695.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff5ac52018---68701553540.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/zeforagovirotudenaja.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f93339dca---wugovutogoposofogunad.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/tosonuvidamu.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f56d1e1e8---buvovazelererologij.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/jlc9o0c9ta74l53lvbditnei0t/24240294408.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/28bea75885pguh6k0i57n8bbdn/sowulejek.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/50101979254.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/nivuvejixasamebogevotoda.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607852f3a8c78---68081541031.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=hundred+years+lonelinessPDF 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_off00015254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15254 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016a6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A6B 10348 bytes
SHA-256: 4bb1ceb6cba81e4e7573817c10aee8429ef5293acaf3f3fe9f69a3b47fbdc086
font_02_sfnt_off000181d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181D0 20144 bytes
SHA-256: b82394b83c44baef696a4d24048d3688486ac728830fb19ff8fbeba3c67eada5

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