Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8c4dfdba24c22a1…

MALICIOUS

PDF

85.0 KB Created: 2021-09-07 10:52:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cd96f3e5e5e5da56be4f2406b086aabf SHA-1: 7b1466b0b3f3fd2d394f55a8e626c0424fa2caa7 SHA-256: d8c4dfdba24c22a18d897a9c44e55bf2a46fbcf95c21c484a19c87682626e615
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting. The heuristics indicate a link farm designed to direct users to external sites, likely for malicious purposes such as phishing or malware distribution. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://garglob.ru/uplcv?utm_term=early+adulthood+definition+pdf PDF link annotation
    • https://cytairtool.com/test/userfiles/file/20210618_df026.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/k80emkbn95l0kjll6lkk821jq4/gamufixopanumisinigoruz.pdfIn PDF document text
    • https://nasco-ye.com/uploads/file/kedixinekisoteniruvoso.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/85907466891.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be22de20d18---konavuvorinak.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/86454651331.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/pofusewuwidedi.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/tezezerotafesowegedinuje.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/kizaxufogufafaremenagini.pdfIn PDF document text
    • http://ncabhsa.com/clients/875427/File/teluxonoseraxogixokep.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16098e8661d52e---tokejanuxavezezuluduken.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/54811009135.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/b8670be939ca873e07cce1007b30c1cb/petomevunos.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210825162208_56gv5r.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/dogccnb606ns6ogn8pb25g09pa/namebofasiborugejubef.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1611d750d52dcf---soxikalolugejakag.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8718dc975---77980245789.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb068242d8---bumadupivu.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9a387812c---dakafikisavaper.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/4qe9dfnpj275avu6b2ih2743gs/kekimudezulajok.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/ei6gtnmp78a3bvqt11052dgjkp/28614886545.pdfIn PDF document text
    • http://moristas.com/userfiles/files/46204352865.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_off0000e6c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C0 18148 bytes
SHA-256: 1b319c20621b79414791166629e2c8bd70f1b31510008f85aa94088c9b2ed1eb
font_01_sfnt_off00011608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11608 10624 bytes
SHA-256: 983c0b4f9f102f275933380b82b659401358954705bbc5a8864f1b2a776d78b7
font_02_sfnt_off00012e38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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