Malicious PDF — malware analysis report

Static analysis result for SHA-256 b18dfa2119794591…

MALICIOUS

PDF

81.2 KB Created: 2021-09-19 08:33:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f0f3d781d30d734a851e958796d8977c SHA-1: a3916c3505fe3c63151ef483397088d472ec8941 SHA-256: b18dfa211979459135c41f0552790ab55c107a7c168ec21fcef21430f5ee07cc
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple PDF files hosted on various websites, some of which are identified as compromised CMS uploads. The ML classifier strongly indicates maliciousness, and the presence of numerous links suggests an attempt to distribute further malicious content or phish users. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/ba2229233308ca086db9ded8cdcff2d2/37987105108.pdf In PDF document text
    • http://symbolfoods.com/files/file///72850728037.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/xefojabofonivugugo.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/mojikudodudomawupam.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/43747483575.pdfIn PDF document text
    • http://chinahongji.com/d/files/30534472767.pdfIn PDF document text
    • http://japan-railpass.info/images/blog/file/78206024566.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/51945250780.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021091813081880554.pdfIn PDF document text
    • http://rnralpha.cz/res/file/73705980472.pdfIn PDF document text
    • http://gr-chem.com/upload/files/76139491708.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/69672434083.pdfIn PDF document text
    • http://bushurov.ru/images/files/fegakibixule.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbe26253bd---fuxuku.pdfIn PDF document text
    • https://kimcert.com/E/file/32550920720.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///waludinejekopuxon.pdfIn PDF document text
    • https://clinicaalcantara.es/sites/default/files/userfiles/file/38390926549.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e4b6803b9---lubaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=android+office+suitePDF 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_off0000d5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E8 10344 bytes
SHA-256: 9725a0c4b355e4e0c14c01de040c5a65e43ddf0d6c94b7898ea90b30ff5a7109
font_01_sfnt_off0000ed67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED67 19080 bytes
SHA-256: ee2d2e9868e43ff85f76b5d360cae5f5395576883f2e5d6cc1c139659c525ede
font_02_sfnt_off00011fc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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