Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4d05b358398aad4…

MALICIOUS

PDF

74.2 KB Created: 2021-06-19 05:12:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d2581b0fd8731d30c198b607c0764d0 SHA-1: 5646df9fb949c0edebaacc364b61dc125cdb2430 SHA-256: e4d05b358398aad4099c0d6e60b3fa70162e0feaa24ba9590c7e27933e98f4e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://catamma.ru/uplcv?utm_term=crossy+road+online+play
    • http://cobansut.com/userfiles/file/jazota.pdf
    • http://jtour.vn/userfiles/file/xomaxafuzesasasunovome.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607eefff381a3---ketolirolulum.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074bc618f55b---bodixuxibubakedebasawagev.pdf
    • https://ratsimae.eemedia/contents/file/27966977036.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb9c70380c---zaviparufofusotidir.pdf
    • http://coalcreekcentenary.com/clients/5/52/52f735e63eff8706e1a2a73a20aef632/File/zazoxegadolukapuvadu.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9f8726133---kulewe.pdf
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c16d02926---68570910365.pdf
    • https://olivierdaulte.com/ckfinder/userfiles/files/61806085277.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/2v0ba2jvesgknlmjcv07duel15/45183110232.pdf
    • https://kme.pl/global/app/webroot/uploads/file/16233147029394.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/57b8aa8b3d995b96d834dd71be8ac9da/88079863863.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/0553cc446f5f6206575bcdd4e0330597/89405624455.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c4f509e2d---35959061978.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085a56bde2c4---winekigakaxanunefujo.pdf
    • http://15fratrowreunion.com/clients/2/2b/2b18ccadde375fd95e9ac2d5db5aaa67/File/pitetowasupuzu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e66f.bin
4308b14e489a3bf03ca61d8c41f0ab1e6333eabbff8fae399c13cda7abe1339f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE66F 4960 bytes
font_01_sfnt_off0000f75d.bin
71a12a4a7f2b1bdfe7e804492bc6e8de91823d64f9e2e2828f71a42f58b181c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF75D 10796 bytes

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