Malicious PDF — malware analysis report

Static analysis result for SHA-256 aecc6ab4a01515ad…

MALICIOUS

PDF

75.2 KB Created: 2021-09-02 20:27:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d802646521c8927b9e9edc4e2ced2c96 SHA-1: bf55a2e4ea0e51e2f021fc31b60d7080512894ea SHA-256: aecc6ab4a01515adc2376ec9288016f66070cce9f53f3eac9f03221861a0d3bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and it contains numerous embedded URLs. Several heuristics indicate that the PDF is a link farm hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of external URIs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608216be39f21---korobafedijamotarur.pdf In PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a833ab92d01---8711605391.pdfIn PDF document text
    • http://leguido.net/files/438294211.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7190c6a9d---xoxikugimafasase.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/7cngl1mom5rh441egl4lekrrdr/43760932396.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608056b614eb5---sesogubisaxug.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/xixigitugixupowugepuzu.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/b5c3fe95c4e771cbe2773f2709f94319/potutojusupibinirijabeko.pdfIn PDF document text
    • https://fultoys.com/userfiles/bagow.pdfIn PDF document text
    • http://mwcapital.net//ckfinder/userfiles/files/75994990715.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0defa9237---remiwoboxinotixasuvera.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a456a536d0e---96195841528.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4da16a3fe---45202439110.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/96460977126.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/bulomutuxux.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/11520296714.pdfIn PDF document text
    • https://smilepaper.tw/archive/upload/files/49238796987.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bda7a490316---65916110246.pdfIn PDF document text
    • http://thecreditcrisis.net/clients/73966/File/38625304317.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/6708a817369a7d68557d6643bdc7634e/kaxawulefapovaxurelekag.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/bovolugogesoku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=investment+banking+risk+management+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_off0000c23a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC23A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4C 17160 bytes
SHA-256: 766ef7dc25e286522ae53cb4a04863a998e65699a6a7db8a44c5bcacf2356dce
font_02_sfnt_off00010672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10672 10924 bytes
SHA-256: f08c30f05b7fbcf04a637aa7136dcb7faca18432c01c4222836d439a20b3b8cf

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