Malicious PDF — malware analysis report

Static analysis result for SHA-256 927c2a3c8eef579f…

MALICIOUS

PDF

74.1 KB Created: 2021-09-02 23:16:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: da16ca674470dba6ecd212536a880177 SHA-1: 8c792315cecd192e22e958ee5bd909ca7a7fe197 SHA-256: 927c2a3c8eef579f405f7119a500f9ba9ed8cc80c64cb747bf58902534e8a7d3
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV also flagged this PDF as malicious, specifically as a phishing trojan. The primary purpose appears to be redirecting users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c95dc79f4bb---98978737772.pdf In PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/a4c94fa58297e38e1e38544cf946df44/rixesunogudoz.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/kexanizujev.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c73227eeaf---mawasukagutefigavemikitus.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c4a5cfd53---46019831522.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/modojilivejum.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/jurisebum.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/b04ac5599c6c488a57886f1c80dd8cce/45340083623.pdfIn PDF document text
    • https://femagnet.com/upload/edu/article/file/ginisifa.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/94161808437.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/dimupozemigu.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/5aab4211df714372c6d9236ff5d9dadb/43825069631.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/81223510593.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/k3u0ke7ai6ebi82us4cdfsgv66/65946751748.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/53523371343.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/lakuze.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161167ffd3b8cc---zomeruda.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/97094892229.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97ac2008b7---76214588730.pdfIn PDF document text
    • http://cityfate.com/files/files/34809776850.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/9004536940.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=mastering+witchcraft+huson+pdfPDF 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_off0000bd67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD67 11032 bytes
SHA-256: e3af003738dc00a568594ce5ab91904106b58fe4ec621ebf4f8058bb673e4189
font_01_sfnt_off0000d6e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E4 17340 bytes
SHA-256: ec7c7011573d5c5026d4f19f13cd6ef78de5e2c0faf4b7e13905b14713a1b2b8
font_02_sfnt_off0001030f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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