Malicious PDF — malware analysis report

Static analysis result for SHA-256 d357edb3d5aeabb4…

MALICIOUS

PDF

79.0 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: e278bb6b959e9579ab5c52c6021e5d71 SHA-1: e8b090bf7a02cde7c9084dc3fe3cc3a57eb65670 SHA-256: d357edb3d5aeabb45fd754eaa75d92ad732eca82e724790fa8a38657333418b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farms indicates an attempt to lead the user to malicious content, likely for phishing or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8850

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://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