Malicious PDF — malware analysis report

Static analysis result for SHA-256 1230b5cd436d5320…

MALICIOUS

PDF

80.1 KB Created: 2021-09-18 05:31:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f6a4210546dbc5367357604c2c8a6b65 SHA-1: b2644802cf6250663db85a4e0fc4d242fc3a9f07 SHA-256: 1230b5cd436d532050ffbd5d58ea17ace263949994b59f04b81009802e5a05c1
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised CMS upload storage locations, suggesting an attempt to distribute malicious files. The ML classifier strongly indicated maliciousness, and the presence of numerous unknown URLs supports this. No scripts were extracted, but the structure itself is designed to lead users to external, potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613456beedb9f---pafakod.pdf In PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136473c6beac---ribiguvezomewozapelen.pdfIn PDF document text
    • https://tessuno.com/upload/files/614067e6595f2.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/rebavov.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/nefobizefitosi.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/vosakadolodazuzowebis.pdfIn PDF document text
    • http://daydeothe.vn/rich_editor/file/gatupogoz.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/dorapadifijoje.pdfIn PDF document text
    • http://cokhivietuc.webthoidai.com/img-vietuc/files/pizixojefogubegok.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/mititojumakuj.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/422f785e0a4e5a310baf3a451e116c71/pijebib.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/topovesimotitelad.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/27f4hu2jm3klcefv00j7rb1hs5/82591027329.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/gomabugiwifeven.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/jibinedizejogoxolav.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/90051230975.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613533b13c81b---pewixijomebiw.pdfIn PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/61735786276.pdfIn PDF document text
    • http://luckysim.com/userfiles/file/44822087814.pdfIn PDF document text
    • http://ijfbn.com/editor_up/zejasuvapakuxofogimujope.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/84454709780.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132633cd41b5---netojokizefitofuweboni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=baixar+play+store+para+celular+lg+t375PDF 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_off0000d206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD206 17792 bytes
SHA-256: fd12e53ae5c219f657c6a63593dd5ee20280404edad42d4f44d07bbf38ea550f
font_01_sfnt_off00010039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10039 11172 bytes
SHA-256: c452298cccc447a5e26525d2e168dbaeacec794ec94da53a6ef9b0b11fd61a2f
font_02_sfnt_off00011aa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1