Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ca54bffc80b6ab7…

MALICIOUS

PDF

87.8 KB Created: 2021-07-14 07:33:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6dd580881824f795a7a7cf21aafb0886 SHA-1: 9bbeefbe8114199dc241015fc656dbccdd66041e SHA-256: 3ca54bffc80b6ab76625d62d5bd5519ce62b5949112994558c9fd571be3acc79
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress upload directories. The ML classifier strongly indicates maliciousness, and the structure suggests a link farm designed to redirect users to potentially malicious sites. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 5

  • 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://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/75a7d895ddd6efc5281c5571411337c8/25814866314.pdf In PDF document text
    • http://poiskvod.ru/images/file/63325640892.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e6831bc0f---kigaliburuvuku.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3a5db188d---25845476307.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/21315993898.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/wixomarexezewekodufagu.pdfIn PDF document text
    • http://aps-mes.com/files/file/zogagemimetogivobevuzakor.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077ade2ca795---77143844611.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/4a84837bef2986ea1bb2fef59cb2b4b5/77878577971.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/wisemutab.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d94d82f1961---lawizamalogo.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/widelan.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1606d51b1d818e---mijawomop.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/ffd05979eedfcd009bb65e90f3e70d5b/44341163270.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5141d42601---xepafu.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/vixalewe.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/baa5c5de39f1ed26da52a7781053154d/fexaditurunop.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9914a8f5d8---3763613823.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/ik8addjrh5r9dqd095c62mi9s5/46768176682.pdfIn PDF document text
    • http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/97554194203.pdfIn PDF document text
    • http://accu-chek-event.com/ckupload/files/21909070844.pdfIn PDF document text
    • http://vucert.vn/uploads/files/fuxarakegob.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/senevi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=blue+parrot+from+rioPDF 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_off0000f368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF368 10400 bytes
SHA-256: 41b72059e0bec207bc71c571971e85d66b12b5f5b5b0b0d4f160e131bd191ff0
font_01_sfnt_off00010afe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12310 18172 bytes
SHA-256: 65852df1a571f1287423297cabf0df112b9fff3f92772fe85baf83db927d6c24