Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6da95bbdfa656f8…

MALICIOUS

PDF

88.5 KB Created: 2021-07-23 00:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e9a39df316c29069966c8025a4e8311e SHA-1: edb6936e8abb27ff8a13af3b4e8960149efcf9a3 SHA-256: c6da95bbdfa656f87c56ed6c7a4116a45799e80c7cfdb6145510c443f9999ea2
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious files. The ML classifier strongly flagged this PDF as malicious. The presence of numerous links on disposable hosting and compromised CMS upload storage indicates a pattern of hosting malicious content for download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fc5be81d8---webisaxakowizoroniku.pdf In PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/743a7c4a738fb84244c48d780087266b/zegepusina.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160baf5015ed39---fugenito.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/90491500046.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/ec9g3bhkpop6m391jvt4jt66id/zewadipuwuw.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/36703300358.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/89974867845.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070df4bee150---34009314941.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/46281718126.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9cfc4c4ec---24516087608.pdfIn PDF document text
    • http://temple.mo/userfiles/file/81794132182.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/rawenevifotugegegogoduxu.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/6s144big9ee057au6cg3iff59u/86657316036.pdfIn PDF document text
    • http://smartarts.bg/userfiles/file/89338030248.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/e60e4aobree0s63ehj8e46l9hf/zoniziv.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/1380426a7dfbb7ae9075c3ea641cd40b/5263225158.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/doxidobabobuxelu.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088db34cf9f9---ruvekuwuno.pdfIn PDF document text
    • http://williamshudson.org/clients/3/35/35bf74ce48b5c120232fd40fb4fe3e45/File/32595879870.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4271ef47f---83135718620.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/lixafabogizexaxitesor.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/29883269167.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/jobijolamafazub.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/87192339374.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/5da2d6c19f4e60b2586730710ec0775c/pedowulavevapitipu.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/m2lmibh2mig0kpcppov5ej5045/96880742686.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=high+school+coach+letter+to+parentsPDF 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_off0000f5b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B3 17520 bytes
SHA-256: 38a5446b73ee997d6b76b808e112e298f6d5852c423b985133fce637b28ee39e
font_01_sfnt_off000123be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013bd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BD5 10644 bytes
SHA-256: ccca3898f79729f07d33e893f77465520450cedcf20a63ae7bea52ac29aadf1f

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