Malicious PDF — malware analysis report

Static analysis result for SHA-256 d428b092e9d56f72…

MALICIOUS

PDF

83.3 KB Created: 2021-09-04 04:56:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e654f20ab0ca81577b8f2e4d9b438721 SHA-1: 9f1355e47480d0ec6defa0289562f590398aaf03 SHA-256: d428b092e9d56f7294e559e0adcebda2c29ed5f6498297f81c6f29395b4da4f4
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external URIs and link farms, many pointing to compromised WordPress sites. The ML classifier strongly indicates maliciousness. The document body is heavily obfuscated and unreadable, suggesting it is not intended for human consumption but rather to host links. The primary attack pattern observed is the use of a link farm to redirect users to potentially malicious content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://queure.ru/uplcv?utm_term=kak+tantra+book+pdf PDF link annotation
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/b94448513791abc3fe26e6c6f4d8e3f7/97542332206.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b07c1b176---mesumusenexitorumador.pdfIn PDF document text
    • https://www.natursany.com//ckfinder/userfiles/files/pobazifosibux.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/dakagejapunado.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/kuburaputonemi.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/361kftnipsbcj0acnos1naaeen/vobevixoribumalojapi.pdfIn PDF document text
    • http://splogservice.ru/content/file/zulirazu.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1b3fe197a---gobomosunamedak.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/tnotb9u2cikt1levdk7ol0infu/fajekekelazojijilodi.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a314a460241---77490586124.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/xonoveliz.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/zipigijew.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/kopegipozope.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/da6dd1229ec8af89a038bce98933e9d4/6982168330.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/xojikajuv.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609adb34b05d7---65104389875.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c0c2b2962---rulidujadoduto.pdfIn PDF document text
    • http://hotstamping.pl/files/file/jijijutofoxovulu.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e182d55dd---57636812573.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/bikowajofe.pdfIn PDF document text
    • http://kesifveotesi.com/files/diponugunefi.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f48424696c---varudolenibivetatam.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210726034641.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/6408472987.pdfIn PDF document text
    • https://dhesient.com/media/duretubefakoretabafizadel.pdfIn PDF document text
    • 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_off0000e25c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25C 10276 bytes
SHA-256: fb47df5ae52e1a3099f453e4aa2317d879eac8c910298944f49b09fefeb6a817
font_01_sfnt_off0000f95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11170 17968 bytes
SHA-256: 4121d754815333130e9305768d0a11475843a17af8eb6f15a866d93aa9f5718e

Open this report in the interactive analyzer, or submit your own file for analysis.