Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1919264c099a0fe…

MALICIOUS

PDF

85.5 KB Created: 2021-09-01 23:25:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c8d407751095a5625ce1aaf676428cdb SHA-1: 879b3f357d10d10afefde1a1e8918857da33f8e4 SHA-256: b1919264c099a0fe0c2a8cc8bbab31de15af20496db688f43c50bbc5909746a6
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress uploads or disposable domains. This suggests the PDF is designed to redirect users to malicious sites, likely for SEO poisoning or to serve a second-stage payload. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 http://krevue.cz/UserFiles/File/katijewujimu.pdf In PDF document text
    • http://czdashan.cn/uploadfile/file/2021052620112473499.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/putajelega.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/005a853981d3226bf869aec01943f08f/70184977457.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/977ad0449ecae1d7fe4f796957764189/babolifuruwomev.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdccc24d2b1---tovekugenusonaderu.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/95a87417c8b34759b13c7e73e7a8ab68/jobajenudorativafizafapoz.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/9c5244e9bb473b227d263b5e85fac13e/26994060449.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/11460004338.pdfIn PDF document text
    • https://wittnebel.dk/file/waxebokedenodaziposotakem.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/serabevitul.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/56107792657.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/1e6a165f5c63780c2d071da561c2fa7b/98959242142.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/62953448226.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/duzozunidagefedufitowoj.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/xunewus.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-7-14/20210714124203518431.pdfIn PDF document text
    • http://marisqueandopremios.com/campannas/file/34422425532.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/f2isq3hlkcsg8ukve9vm0rsknu/26671169429.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/07662716c2a24e82738e011ffbe27d40/tavejimuxupe.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ae466c9ff---53653667603.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=jaw+popping+and+crackingPDF 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_off0000eb00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB00 10416 bytes
SHA-256: 497c5b40a2a5c2c43b0f5a9b5150b73ae0cd43aa217fc23d07cbb0958cd4c301
font_01_sfnt_off00010285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10285 17448 bytes
SHA-256: b44c14693ec823f2157880088e712c34d76e0bd123b67215dbcb50545423b07c
font_02_sfnt_off00012f5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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