Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9b893328e40b679…

MALICIOUS

PDF

76.2 KB Created: 2021-07-07 08:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 38f13e6ef8b2768657e01a67f40ca7e2 SHA-1: 9f05a34d431ff0dd42485901693adf05f291554a SHA-256: a9b893328e40b679b3d1d901eb3937ff2e6dd4f6af5a5fa2bfbf8fed6db34eeb
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier strongly suggests malicious intent, and the presence of multiple links hosted on potentially compromised infrastructure supports this. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5b233cd71---16927942378.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bca0c564b19---segimevofawanuwada.pdf
    • http://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/telunatemupijoxij.pdf
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/fc8e0b9758654ed257661847f3f089e2/waketigoditaxepom.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16092c2c04e07c---42635011361.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609498cc3ebaa---10885104869.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9901b262c.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160787d30e4a61---fuzod.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/c59ed91df039a37c6a2406477ddd5f5a/66038067937.pdf
    • http://surmounttravel.com/userfiles/files/66473242791.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/1bc36ac860ad7aab34f7a4bedc73a70b/22963301122.pdf
    • http://colafranceschi.it/userfiles/files/wafovipujoperenadal.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160cecd1f74321---39649945163.pdf
    • http://kimandyoo.com/userfiles/file/gokopakor.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609455b7b0808---16118989124.pdf
    • http://dabaizhongxue.com/upload_fck/file/2021-7-5/20210705015030789164.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16095f3cf9e209---fukobeke.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/28b1b91d72c3a2b223242ad369614db6/54807945714.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/ikq1af84egt4ulnbg810ota314/1040242684.pdf
    • http://sumbulefendiegitimvakfi.com/resimler/files/74528832726.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1609b186bbfeae---mositil.pdf
    • http://tillmanfamilyreunion.com/clients/b/b7/b7385abc5988d1ee605fea7695e3d00e/File/1852648775.pdf
    • http://lahma.pl/_u/userfiles/file/46078616232.pdf
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/1f081233b71aa207bc04670225859b4b/wuxomi.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0d4a4a00f---rewogirurizukit.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=list+of+words+in+alphabetical+order
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c858.bin
9c2b76760017595e51867f0a7490cb586eda46d38133afa348c3c252796e9e19		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC858 16176 bytes
font_01_sfnt_off0000f233.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF233 16792 bytes
font_02_sfnt_off00010a4a.bin
90808f4010d856cfbbe3a37f0b194e22471dfa6af3e10e07c26d314e182bf6ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4A 10900 bytes

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