Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2bc6cf42df42da7…

MALICIOUS

PDF

85.0 KB Created: 2021-09-02 19:48:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 48a3b8b93bbf85538c90a815a0f1e58c SHA-1: 68aeb4f0dd13fbac90c4173df1252560318f5ad7 SHA-256: e2bc6cf42df42da7e72647f481dd35f9951e8c3a7b29b8d3b9fa28ad9581c281
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs further supports the attack pattern of luring users to potentially harmful sites. No scripts were extracted, but the overall structure and URL analysis point to a phishing or malware distribution attempt.

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://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/cc8029b29abdd1776bcdb139a5ee0b6b/60702714423.pdf In PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/4037721760.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/35939662530.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/benumelubibilepukupim.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a003102fdf7---9576699793.pdfIn PDF document text
    • https://btegypt.comfile/73468058355.pdfIn PDF document text
    • https://susta.vn/userfiles/file/fudazoxup.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/84758996198.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/ba2e2f1300be16e2013f1ce61be10dcb/saboxewe.pdfIn PDF document text
    • http://reclamesticker.nl/images/uploads/file/bonimesax.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160f6259b7bc74---defomipugavom.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/84816379616.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/52945027542.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/b1a343e4acf526608dc0d1e7d1552924/zapigalijo.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210807_031633.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aea101d2c12---kowone.pdfIn PDF document text
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/nibuwosixuv.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9063c19e0---52975667262.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16103b1de145a4---26371373509.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/e7278caca057500451c64acd532d077d/fegaxojawojuzel.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/br48rrj219ujbbbei91q1pacji/xugezovis.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/4673a09e33365f7c3f10fdc31507b570/1762684162.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/45078278950.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1612550949d3e8---41220323645.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/31966687807.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=inductive+reasoning+test+answers+pdfPDF 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_off0000e75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75D 10952 bytes
SHA-256: 8958d96e5f1ef2ac9f2aa09e436b76cdc50ed376698b8d5970676498b08c32d7
font_01_sfnt_off000100c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C5 17440 bytes
SHA-256: 52fbdce5e85db485d77825ccb43cff6d4b864d257ba83d2f6ba2ea2dc86cf1c0
font_02_sfnt_off00012e32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1