Malicious PDF — malware analysis report

Static analysis result for SHA-256 382949d6ca0982a4…

MALICIOUS

PDF

89.2 KB Created: 2021-09-01 10:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f89708f30c11b3be49408ee37a38dea4 SHA-1: fb864fef1a58fd7238e02bb10013bf6135c2c061 SHA-256: 382949d6ca0982a4d4d8dcd41100752262e92dfb8210e9a0a13f78a0ca41b78a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs, many pointing to compromised WordPress upload directories. The ML classifier strongly indicates maliciousness, and the structure suggests the document's primary purpose is to redirect users to potentially malicious sites. No scripts were extracted, but the PDF structure itself is indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://auxerretv.com/content/public/file/42409703602.pdf In PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/31474816090.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/kelodiwajo.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/9e1fba82ec5413c9cedd48a712f94bcb/79687270176.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608323812f5fb---9644519681.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/9dcd788d1c1eea43e00eb04ba40c145c/sotopoke.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16083397ca0613---1966748039.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/20198734803.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/dunibefixatataz.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/74469b017b1e6aaf9a8e876384fd3619/jejesevezikeden.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16090714303ae5---bulabolorarilasejafos.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/pejunurixidafozominu.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/93594914755.pdfIn PDF document text
    • https://4appsoftware.it/file/rosene.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/15433333403.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/lemet.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/b6vasrjqo7oeecosv7oh89f2m5/fananugijixukikoput.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/58869259156.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/69213917242.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/nofebi.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/tusifavosoxowunuvijenageg.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082c0c60ae06---marapezijixogujubalox.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/10902193697.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/070qvkh8fduq91t0plni2etot0/kuzezemujosapuxeluf.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a48db6ade---43199255078.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=best+rated+pizza+near+mePDF 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_off0000f745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF745 10500 bytes
SHA-256: 62c206e091a31ad73f56c4bd877fcadb826113878374d721e875e330829f4f37
font_01_sfnt_off00010f2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001273d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1273D 18288 bytes
SHA-256: 28c5b09e96542587bf38a671115f661135a99ef370c98ef5d45bf00818b4ec01

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