Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6f18ab6ddc3f92a…

MALICIOUS

PDF

97.1 KB Created: 2021-08-21 02:11:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 00388baa1d3d6d4255e8e0f1ebdb58e6 SHA-1: fc63225116bc5935d9a9434c920edf0c43b9f4f6 SHA-256: c6f18ab6ddc3f92a886ba5dd2391d2f801adb9881608ee4d00e3da15a45c2647
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or other potentially malicious hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish users or lead them to further malicious content. The document body is unreadable binary data, providing no direct clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://captaincook.hu/userfiles/file/36292469396.pdf In PDF document text
    • https://pet-fashion.ro/mm/file/feguvewew.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2b688bb2b---20885403779.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/gadamajokaxevetavo.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/kufumozijumikanunata.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083075f18e5a---vagusumavokevaj.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7af2b7612---10117814799.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/814d13fc624cedb73d21219782e7f9e4/nukiko.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/fdvtvr1ofq6amrvh2ab9u4a9g2/tugijekamavazutepek.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/83941c21bbb607de579d40ac418aeb2f/1022280717.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/n4b3cmrkv9ifh6u4fjue3t5udq/37729518976.pdfIn PDF document text
    • https://tamphuctriland.vn/upload/files/72359127555.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d46a215c13---babolemuvubif.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/df15525e5374d4eee9c09a19ed3030d3/tigodefalemelutejamig.pdfIn PDF document text
    • http://acril.ru/ufiles/files/tokex.pdfIn PDF document text
    • http://ashioke.com/images/library/File/bawovitujebuninez.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/f99bd76311663f5898b98d47ef9b32ba/guzifujidukobadepojotud.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/30977046600.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/89081804587.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/10902411373.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7cbe3a142---nurerogimepajinug.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609eaaed23342---23111732843.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zesuwufovapiwok.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/65847757262.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=pokemon+lucky+block+mod+1.12+2+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEB 16064 bytes
SHA-256: a013ce2342554bbd70a9f85285a6053b67e9b25eaba0dd22223cc179b1b1ea16
font_01_sfnt_off000111fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FB 18280 bytes
SHA-256: 1ef9df58979f6194892915784bb9f370d32d9e126d645c9ad979ee8b1177a9c3
font_02_sfnt_off000141e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141E9 10844 bytes
SHA-256: 328ed1da182dba218477d1afc762ecfe476c8e0889405ce034ea7f2688fb6167
font_03_sfnt_off00015b22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1