Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7ea58217a18c4a1…

MALICIOUS

PDF

112.8 KB Created: 2021-07-20 02:21:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f8e09eabc0a86d9e94229203b43c1b6f SHA-1: c6a1697fc38e5932a84e2ce4d4ee633ebc248531 SHA-256: d7ea58217a18c4a137e454cd040608b64502521e49bf36356b6ec99fab2882c1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. Additionally, it features a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host malicious files or redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely involving phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.thic.net/plugin/ce1/ckfinder/userfiles/files/40431965660.pdf In PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/e9932d0aca6eff2c356206133fa8a564/gevukubabuwasagefanifom.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16077544aded69---virixowetifumizamusi.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db0a1796a25---wuvanovavejorax.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/ovcpg2cvb4qhj9sho9mg0inajs/viwepofuraromasobofike.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fa76674e37d0ee19d32f4e1f52c2a27c/66833980622.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/42f3d9f57e13446a1e2f258803f82f76/gerusamilomoxa.pdfIn PDF document text
    • http://mobilephleb.com/clients/2/2d/2d2188d13063160162e6e2bbcdac547d/File/vekububovemepox.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/goxaf.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cefbf535f3---2420190715.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/e256bdfad6b36e9f1381a3931b685b06/10349726101.pdfIn PDF document text
    • https://limmaginebistrot.com/file/38043735918.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/b231b6bb5601d948befbc9517e4547de/xefovis.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de197e78052---95435647165.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/fbff04f6ed7a48d4130bd4cb87c71640/gojujupimosuwetini.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/048b0mka98f8l0qo9mh59l402u/23118473096.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/nikufakodegenefe.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/2a6c51a2479bec4bc84d63d74617070a/4664106882.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/todajabunokolafikifup.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210618_119B08D56DD37CAE.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c55cf24bc65---lodare.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/lixaku.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1e38ac685d26a4afe2055fc8743399ce/27923544859.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080c31179a66---54985930696.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=fluid+dynamics+meaningPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013ef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EF7 10584 bytes
SHA-256: db90c02565e65891113bf778f0447756dbc6e2b0780cd692fcca47bd125e4494
font_01_sfnt_off000156de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016ef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EF0 18764 bytes
SHA-256: f67991e07c75fb5ab5747489a3a766d7d5bd2285edba6c8e746818addc93dcd6
font_03_sfnt_off00019fe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19FE8 16180 bytes
SHA-256: 5fe250aed078d0ee0c8a6eeae28bcf3660a94536c0a26c91209d7ae7f0165d2f

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