Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bfb79a5f6752b12…

MALICIOUS

PDF

78.9 KB Created: 2021-07-20 15:35:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e11b3a3d80d34d457735f3d2705745c7 SHA-1: c55b0b104e79e91316a108d666182df5314491b0 SHA-256: 0bfb79a5f6752b12073b83c8393fe3e73352ada24cf322b4ce856e3d7f0ad082
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of a link farm designed to direct users to potentially harmful external content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16096466100f16---rokukof.pdf In PDF document text
    • https://guineaservicesproviders.com/gsp/files/31037396680.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/gusanetirane.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/76399955537.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/14513084446.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kibupikalemenijefaduru.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/cfc76b84a76c2957c9f97c349c00898d/97812047577.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a253ff2a141---zanedetefigozupujidepi.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093afa84ac00---45190724013.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/wutemamajikin.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/wewenenuni.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/vnmbhperghqr6pjlng4mapk8s7/16375096352.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/71503497235.pdfIn PDF document text
    • http://watsonwilliamsreunion.com/clients/82103/File/voxomasiwadinufiweja.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/62463024170.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609b898c67e4a---fegita.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/kanakupujuli.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/rupawajivowuk.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160776e949a3e2---zumujujaxolesor.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8ra95vqj58mqqq5iprddrhi6h0/tudopemonimipisalaga.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e398aa2e41---27382467878.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5575e382a9---loletozad.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/d1c90ef624434f6610959721755cc1f7/wotezuxagifotamiwumosa.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/sisozizig.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/vl0j57qjeevel841ak5s7764l6/melebobidelivatijej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=from+array+to+arraylist+javaPDF 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_off0000d4a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A4 10320 bytes
SHA-256: 0e8f5b4d1296b20cf0403f481767542a0206f4af9d06a38a0ee424c40964ff6c
font_01_sfnt_off0000ebdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDF 16280 bytes
SHA-256: 1320934d2396fbfac84484fbd4c25057616170cb389f3e1355b9f9e9dee7fa9d
font_02_sfnt_off00011618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11618 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1