Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0fc222c7a745f71…

MALICIOUS

PDF

81.1 KB Created: 2021-09-23 12:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 119143484cf3be69cb03c8b864167b5b SHA-1: c75adba226ee3513669b0e6e4c9c1b1b66e00213 SHA-256: c0fc222c7a745f716081cd82c285bd7a4783c965e3fbcad73d281cc409bf9aa9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to potentially malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://winkeleninzundert.nl/uploadimages/files/giligilafojipil.pdf In PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/28578097090.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/kibofewuguzopik.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/98537605879.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16145562300b10---58591030745.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/70699978365.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135cc6380067---37677789999.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d232bde31a---juvulovixaz.pdfIn PDF document text
    • https://robindayne.com/ckfinder/userfiles/files/34413072981.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/29853654907.pdfIn PDF document text
    • http://www.jasolasia.com/image/upload/File/62344111170.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/totinelerezadu.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/wivafe.pdfIn PDF document text
    • http://printific.com/images/contentimages/files/taverutaxinofobata.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/64345347030.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/xezuzidob.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1613303e4289e9---radopez.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/jakifidibukagalewob.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/datuvodewa.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-2/20210902123535997596.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/38042183995.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613b838c7cb9f---fitudagofowaxemaseku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=relojes+para+android+gratisPDF 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_off0000d566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD566 10744 bytes
SHA-256: 417f56675c0a3525d72ea379d20670238bd555c791c4547c7067c1c02df7dc69
font_01_sfnt_off0000edf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF7 18832 bytes
SHA-256: a15c4489f9f353e2be94152257c6a429d0cb20771155ddb0baaf82d7ef003db8
font_02_sfnt_off00011de9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1