Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bd75de89833be81…

MALICIOUS

PDF

84.5 KB Created: 2021-06-30 12:23:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 57fca8f709a75161d9af200027eee574 SHA-1: fc143e51fb10f792ae56a76621b5ebe136a7559e SHA-256: 0bd75de89833be8149864d4915082e5d7967593f08073470a3c83e24e1a8437f
96 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's designed to redirect users to potentially harmful content through a link farm. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://afghansolar.com/userfiles/file/jofibuwunizezowanasikepe.pdf In PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16077765ce2177---15837167375.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607548e57294c---52469324450.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210618125153.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aae44132ae---1728974849.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/1hktnirqsroq83m7eeu1q051pc/77450918069.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/q8pro0aq6voh2udgeq0g4ug4sh/53964624478.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988b548d313---buvonoxakeligesatokodar.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/kewajatotakufivolopixe.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/84679792885.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/49758199139.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/829967d066939d788694fc838932c62d/radiremunana.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/momawurasaluzaremotasiduj.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/gonesiz.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813837e18b9---59928493142.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/jecsls22m42mfdt7kl4prtsagb/84253585580.pdfIn PDF document text
    • http://ehs1958.org/clients/73155/File/zuneganikeja.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606efbb72e480---fupitawimutivawireke.pdfIn PDF document text
    • http://sammyuriasproperties.com/userfiles/files/22371448722.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/9143391959.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/pijufefadevanasokanije.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/435e02cedcbb955ebb4e61e4fce399da/23839033259.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/fccca1e144a6201156359472b6f892f6/jokozomiribodu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=science+9+class+solutionsPDF 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_off0000e8fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FB 10468 bytes
SHA-256: 258f17825a75a919da2b48781c64e85aea36fa435bc3700ab5524167026bccc1
font_01_sfnt_off000100e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E6 17072 bytes
SHA-256: 5e011d1c8fd64e736585719681dbff0d0f76262a58d0099611e6a2f63a75d5a5
font_02_sfnt_off00012c97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1