Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbf193b37b17fe40…

MALICIOUS

PDF

67.4 KB Created: 2021-06-22 12:25:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 2bbe145ba2d51c7aac917d92d1aa8274 SHA-1: 2ea4279472e650bbd7deebd7fe6e72d85aa44581 SHA-256: cbf193b37b17fe40fa97b708a2f7b17f48dc5d736ed699ffde300867330007e8
96 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to manipulate search engine results or redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting its role in a potential phishing or malware distribution scheme. The presence of multiple compromised upload directories suggests a coordinated effort to host malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://sevoir.hu/uploads/file/57791184480.pdf In PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/5000447e9de3a80118a01ee7774c7b47/fagowod.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/371d74f34d3f9a3c108d1031604454d2/81619918199.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb57e56474---65512479707.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/lijowavexureniro.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210621_C5203740C8486CD0.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/7cb8af4b47225ce225338d4d5a694245/19537382777.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988bb2332d9---62564536065.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/0f31d29ef2503d4d71f5cec5040a9269/70966716024.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/3f0404897c09c73120d7ce43b9b5a7ad/70113512329.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/05t7agn83e83trn9n69on5uha5/dugol.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/popuvas.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c690a0e570a---422320098.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/36e2d0daad739eb57d77db17e533da3d/10671276276.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/vobuzeba.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/LPIa9PGmDLg/uplcv?utm_term=strength+of+materials+pdf+bookPDF 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC770 5764 bytes
SHA-256: 7b01d20899f9a9ef107be30398b707b0bf4ee331a8cd0f1823e628d9425659e0
font_01_sfnt_off0000dad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD5 11440 bytes
SHA-256: 2cda0d287c35d945903c0f82512c68126119209d4e06c6156178c0869a44e184

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