Malicious PDF — malware analysis report

Static analysis result for SHA-256 09fe20d827cbb655…

MALICIOUS

PDF

69.2 KB Created: 2021-06-22 22:11:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: b57c5d5564c5ead968e77d0e0e2128cb SHA-1: 6f66e86daac535627e0f8c8df3bf2ea988cf575d SHA-256: 09fe20d827cbb6559baf2945541c49b43e64cdb4c5c6463dd78d11c7026fae0a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories and other potentially malicious URLs. The document body content is heavily obfuscated and appears to be junk data, suggesting the primary purpose is to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/cf3075013a2358e4987c8cb07174836a/93304115347.pdf In PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/6l5jbrh097u581o6j7rikgc2r5/44507813690.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/ferulagexev.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/lowusejura.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/m3ab9viaqb06lrbqm14pnugfaq/90019307218.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/53963977114.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0d6822cb8---57207258802.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/62476d6d5a03a3853e167c9c257a2a48/savunatozitugis.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/6c8d7a30572f7cb00fe72ef5bd5f4e8e/wedupopilobadopovego.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/fefefijulilutunazedis.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/zubesazezaroles.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/94d9bfa219c6a842a434002078754123/wavis.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/soxozaramowojebuvikijuvor.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/71406879488.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160ce9e22a056a---varanuxuzusuvepi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=15kg+in+poundsPDF 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://scripts.sil.org/OFLIn 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_off0000bbf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBF7 4936 bytes
SHA-256: a0246a5b2814519b0d73409df385adfdff01177f8ca35f976659e656e2f67c5f
font_01_sfnt_off0000cce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE3 10644 bytes
SHA-256: bd410e9caf1cc5ec1bcb3d02bb08a084969eaf48f631b959666f07adab293b12
font_02_sfnt_off0000f169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF169 16216 bytes
SHA-256: 70f40d70559aacc935f14be6aa78542955531c8ec73b35d0bb8c03e7c63a2f02