Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cc8d1abff6615b3…

MALICIOUS

PDF

86.5 KB Created: 2021-08-17 13:57:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3232e2cd50bf24f97b7f8201ff95da8b SHA-1: 24478ba64fc53fe97fe264696967ef8e9db96e70 SHA-256: 8cc8d1abff6615b32cda37be3f02f6902de25ad433afa20e5c7dd822dda76b9c
96 Risk Score

Malware Insights

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

This PDF document contains a link farm pointing to numerous compromised websites, many of which are hosted on WordPress installations. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest this PDF is designed to lead users to potentially malicious content. The document's structure and the nature of the linked URLs indicate a probable phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c348d38d6---zezujumoxen.pdf In PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/eb593abc1bb9fb93ce48ee9fd7bb44a4/24903847010.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/93532255410.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160787806c492f---gimipulodu.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/75365132794.pdfIn PDF document text
    • http://1960ihs.com/clients/e/e0/e0b58928a48036c9af8d6cfc9cffdd99/File/39716711566.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/791e7bfb1be02a69ff9b6d1f1a50f90c/54193671528.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/93306127054.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/61444553519.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160964942289de---25036399260.pdfIn PDF document text
    • http://maytinhgth.com/userfiles/file/44247544438.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/998cc94058f7aa9b758d66bfd6eff3ce/1567532449.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/2f15a90133530ba0c02a939d38320d82/segupeselivadizidofakukuk.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5b243eaf2---kufok.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/87502504868.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16096af250c3bd---zofal.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/4822d1e3a6052221a4f2a04d11d37823/kojopupixe.pdfIn PDF document text
    • https://mattress-leader.com/media/28430423985.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/64208432381.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/75603799668.pdfIn PDF document text
    • https://afayl.com/userfiles/file/sizojuruverokebajiz.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/niturojezux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=descriptive+adjectives+worksheets+with+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_off0000ee19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE19 17052 bytes
SHA-256: 80edea063cbe9099d7cc59cf7c6ff27425c71c483fe5a55d44c5aca08fd9b56a
font_01_sfnt_off00011a07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A07 11048 bytes
SHA-256: 9c2dc4cab947eb9b9c7db2595d7b6678f9bb585aa0532f88359aa985856443b5
font_02_sfnt_off000133c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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