Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ca6a9faad0fadf5…

MALICIOUS

PDF

101.1 KB Created: 2021-08-04 01:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d66acae71c62a981ea7a47b5f8c50cd9 SHA-1: ca2909400869e511e6d20ea685c30907ffd6671d SHA-256: 5ca6a9faad0fadf5c4e30b28ea8b05825811bb952a5a5e68d18b90b9d6a3faec
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 upload directories, indicating a tactic to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristics and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://narcisse.sk/editor_uploads/files/12272691962.pdf In PDF document text
    • http://canoeing.by/pics/files/93135206598.pdfIn PDF document text
    • http://computerdoki.hu/user/file/56874635373.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608382c62e7da---kozirirewifoponixelerel.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160effa8897133---gogofadaz.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe304e594d---64406322379.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/20512922755.pdfIn PDF document text
    • https://nevisnews.com/userfiles/toribokezo.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/12142789205.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160cd106a4a62d---10951002506.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/wedejupisepevuvubag.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/033848ecae3bfe970f480aa3dbf2e2f6/vegemewulo.pdfIn PDF document text
    • https://digireg.cn/upload/20888149368.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/xuzujijorefuja.pdfIn PDF document text
    • http://cctsjwhs.com/clients/0/08/08395bc9c2b8280888f0dabd04457394/File/97951112831.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ee10efe9d---jugifenuve.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/mijukasasi.pdfIn PDF document text
    • http://15fratrowreunion.com/clients/2/2b/2b18ccadde375fd95e9ac2d5db5aaa67/File/jugunimisuwa.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/jozibofetuxabagerat.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/7447vbl6ts9g17bgrdhunj7l2q/52876246612.pdfIn PDF document text
    • http://tingyi-bnb.com/CKEdit/upload/files/94359164700.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/mnnqvqi9ub53ue36hnmfokkj8r/woditawipelevod.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/11765017556.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=what+do+colors+symbolizes+in+the+susceptibilityPDF 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_off00012853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12853 11184 bytes
SHA-256: 620f1b5e54d0e917a387c252262febd27a7729ac16df052dc568c6de1ffc7a11
font_01_sfnt_off00014227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14227 16964 bytes
SHA-256: 4af2f690efe6858907c60fe0f7b2f902dab42e7eb430e5328ce3602e9aa94e17
font_02_sfnt_off00016e6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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