Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f73e8ddf7f942fa…

MALICIOUS

PDF

85.6 KB Created: 2021-07-07 16:51:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: cfb949e6abbda5e9a8230716e85cae05 SHA-1: 0264961a03f958791d6a0d967dad32f94bc488c8 SHA-256: 0f73e8ddf7f942fa4a82347cb5204a7bf894e77a213b4a6a6fb392651a23f9d0
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple compromised WordPress sites and other disposable hosting domains, suggesting an attempt to obscure the ultimate destination and evade detection. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=fourier+transform+of+cos+omega+t PDF link annotation
    • https://numberonerevolution.it/file/bobofopoleladedigo.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a463bf33b---kiwazapakatufibinip.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160907113052bc---82202079893.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/43180962507.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/sopaxulamezevabizofabob.pdfIn PDF document text
    • http://ha-sine.com/d/files/zasoxelonasoju.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/4kf25rciccjsnnlkdih36c4cmp/mizitotejip.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/747540092a4228bfd9dcae660e63c70b/86431157024.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/972153c2884c52f664a58d0c9293390b/46807772161.pdfIn PDF document text
    • http://caryhigh1987.com/clients/41333/File/71106467897.pdfIn PDF document text
    • http://soflacops.com/clients/83266/File/nojezebo.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9f54368b0---88813450208.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/xidigazatojojudoxupiw.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f93e6a6b1---kuwogepuvazujadowet.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/ebe68c4a3077361cefe5e6fef84a9f57/48325383916.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/nutuxabevijipejap.pdfIn PDF document text
    • https://ijpdua.com/contents//files/rerase.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/fepagag.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/9ad3be21aa85370d1696ee02df7c4c05/78898628924.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/76051209658.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/c60870f28db654205c5207410631626b/xumixediluburiwetenig.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/subusogatumobililelegufij.pdfIn PDF document text
    • 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_off0000e448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE448 10712 bytes
SHA-256: 1b7e751c0f09154156f5a0380876e9fb77acd49612b072422ed725a2800bcaba
font_01_sfnt_off0000fce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE4 18872 bytes
SHA-256: 3501fb881f0917998618faa6da8cb8e67f119410b8cc1c32d014187511dfb087
font_02_sfnt_off00012f77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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