Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cf59e307216c812…

MALICIOUS

PDF

72.6 KB Created: 2021-09-03 06:18:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e1b20b0a2b0e391c283cb75a98306df9 SHA-1: 3faf2a97cbd03a7601c0e3fdd4410b7936e0b4ea SHA-256: 2cf59e307216c81273c01b21a223fc77fa86e011c634638dfe5e31f608854961
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites and disposable domains, suggesting a link farm for SEO poisoning or phishing. The ML classifier strongly indicates maliciousness, and the presence of JavaScript points towards an attempt to execute further malicious code or redirect the user to malicious sites. The document's structure and link farm tactics are consistent with efforts to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://cructi.ru/uplcv?utm_term=calendar+of+event+2019+indonesia+pdf PDF link annotation
    • http://fapannimario.it/userfiles/files/sosunutufimiwowewav.pdfIn PDF document text
    • http://innotack.com/userfiles/files/kuwolu.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a22930cd0a3---kitexegigeki.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c850a3c9d---49276907802.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/meleleduzarevujikeniri.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/nobodanuvetuwexad.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750deda01d3---kubutomirufasetawagus.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bd45e4d36a8---miruguma.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/lasibimajesovom.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/3552befbc3802a85f9fcec6b859c2292/tefusupojede.pdfIn PDF document text
    • http://computerdoki.hu/user/file/67559748807.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/76438571519.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8e28c437d---kovubaxabilurusirig.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/95736022717.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/vatilamutajaxe.pdfIn PDF document text
    • http://uzks.hr/upload/datoteke/fowawexokujut.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/gojos.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb41760596---kojelekasi.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/49b00e8e0b6f114faa94abfae154b942/49961611765.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/188fd651a404a8a694cba6ea12a77b28/ridujatemuxoxalorakiw.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070aadcc187a---gekunejedumok.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f308cc59c0---kasadugiv.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8484d26336---minatikobi.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_off0000b87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB87A 16508 bytes
SHA-256: 75bbf504884ecf579194803046d9509a94d7e0ff5f621102a64547b93219fc55
font_01_sfnt_off0000e2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FC 11052 bytes
SHA-256: b2ade382787d38cd2e76b731baae008e4fbcff9f994a2cdd5e2fe4099aac755a
font_02_sfnt_off0000fcf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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