Malicious PDF — malware analysis report

Static analysis result for SHA-256 84f4c2c13f82255b…

MALICIOUS

PDF

92.1 KB Created: 2021-06-29 11:26:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 5b4f8908235440a53f5932e043a52dbe SHA-1: ab20397214647e9478d3ca6e7f61f00de57c663b SHA-256: 84f4c2c13f82255b0691eeab60a429866fcd3fc907ac85866a4badf2364cbe7e
96 Risk Score

Malware Insights

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

The ML classifier strongly indicates maliciousness, and the PDF contains numerous links pointing to compromised WordPress uploads and disposable hosting. These links are likely intended to redirect users to malicious sites, potentially for phishing or to download further malware. The document body is unreadable, but the heuristic firings clearly indicate a link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/4d1rf2po9m7rcuit71hoo8smhe/3128133045.pdf In PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/77e7233ecb017ddd7c753a61c935cbfd/mixozodino.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/13430278910.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/raduvemox.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/70834083162.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/xivelo.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/51d458ac80c9cba6e087aedd0d0170c5/48497267744.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/pulisaxaj.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/29090156324.pdfIn PDF document text
    • http://kolasinprevoz.rs/slike/files/10652669459.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/92273394149.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/050111118555.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/3285820757.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/7093043876.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/tupikasolugalo.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbcbb465f6---gijerodadimafoso.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zunuzajijewizovenov.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb638d82cb---zaloguzuroganopepajadavag.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c873ae8b05a---95045949200.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab075014a8---lesanetuzi.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/dea24859c287b2f7f4e6e91cc8609e4f/17929456609.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/rekogaxidifafavomikef.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/41321966145.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=amazon+workspaces+pricingPDF 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_off000103aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AA 17264 bytes
SHA-256: baacc8b622cbeba1240f6b106d830c05228dcf2e69a0985563cba305b3973197
font_01_sfnt_off000130d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000148e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148E8 10792 bytes
SHA-256: 0487b646a09547d2a6600344dd18b41bc9582b8bd8af73e4eb8cece35bae25e1