Malicious PDF — malware analysis report

Static analysis result for SHA-256 f303855f43243d5d…

MALICIOUS

PDF

69.0 KB Created: 2021-05-17 14:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 004b64588f34a350cc95002fe2a0f3d3 SHA-1: 26893e271c60b60b9f68909d645cdda3517a1034 SHA-256: f303855f43243d5d0290fef0f46d4efefc0744761c29ee1e7d713f63b7aab9cb
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm or redirection scheme. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs points towards an attempt to direct users to potentially harmful content. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ff4cd653a---muxulufomurulowisejima.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/f9b7616159f463d67ff17d1b7e435588/lipuxidim.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088b9fdbaf8a---daxizexizosiruj.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a5696f8da---80085166780.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/c09e845fcd40a75093b7108801b9b5e4/50856801169.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/535v1bll0c5kl9f200k1tgedbb/wagikegukebef.pdf
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/ab0c470b25696fc406edee1e65b1f152/56952296655.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4fe37264c---venubaduxifatewipo.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/b9bd1377d82c330cb6562151f12d7c45/nezejexeravazu.pdf
    • http://africa-emergence2019.com/userfiles/file/tesuminufafusap.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b78f7cfad---12001617895.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b53b2ad3dc---16325126356.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2c19d517c---jejotetebenotolazetutare.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/endvgm3jtgoos0a13o19msjhf7/nebonomotorok.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607edec8dae7e---25533414072.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=cursive+letter+writing+practice+sheets
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d227.bin
3473694d1df6c1852a3fb5e7404a88f6b0547e5f6b9b684d332b76203305d87f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD227 5252 bytes
font_01_sfnt_off0000e411.bin
5f865ea53f66e420d0200ca7feb96a21949611c71f11c0a6c2c09246ad9a3c0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE411 11460 bytes

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