Malicious PDF — malware analysis report

Static analysis result for SHA-256 60f0b612d863b224…

MALICIOUS

PDF

98.1 KB Created: 2021-07-14 05:22:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 454d6169f3ac82b45b57ea1458e8d464 SHA-1: 7df25b279c74a02d7848190b85a87634f027d8cf SHA-256: 60f0b612d863b224e3910fbb4f52bef044666b237dc37df2be4fc0826b3e10cc
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious files. The ML classifier strongly indicated maliciousness, and the structure of the links implies a lure to download further payloads. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793b8672044---17987872222.pdf In PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086fe10d68a8---77769237392.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/tebosiva.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/bj4m8hiv0ed4tk1o793gspouaq/biwojomifujorifu.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/18670580991.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/3d3c24c54e53e645d78306b7a0e6a53f/vuzifi.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/wurozanetil.pdfIn PDF document text
    • http://accronline.com/userfiles/file/finexevimanomosodowozoji.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/69358132751.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/tofixo.pdfIn PDF document text
    • https://dm288.rs/slicice/file/23391888652.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/f017fce6754473185f2379b36fcb5d3a/43727523494.pdfIn PDF document text
    • https://norservis.com/files/files/liwulogiwokoz.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ae3dbc4f8---23542712920.pdfIn PDF document text
    • http://megalaserasia.com/upload///siregu.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/oq3at0hsjmccb4p9g8gh9gqg9m/47060626031.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/69500268024.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///94393457503.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/posaloda.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/guwamubona.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/mawuminegota.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/82fbpnbv79to2b5mlcmu284aht/nojiwofolevobiwez.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160cb4ec6a6f9a---pigatapuparokumur.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d31689e2ad---fewetotafotamejem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=which+states+have+quarantinePDF 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_off00011cc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000134d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D8 10464 bytes
SHA-256: d49af4a870a22a6faf75271fd930ccbee6214c0437d8932635c163c4eb2bb36e
font_02_sfnt_off00014c9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C9D 17640 bytes
SHA-256: 19c4cf9df0b8dfac6e24c3c656b9ec2d090d4714f4dc1cbd1b692a2523466f49

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