Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b3070d0ea8d9902…

MALICIOUS

PDF

87.1 KB Created: 2021-07-01 14:03:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 20ff92ad6ccc146c96e96d804f5f6269 SHA-1: f20a9e83d4c8374392ab1e9c0e9ea5a0cef6a188 SHA-256: 4b3070d0ea8d9902f14e11406f6cc1910d3a3233e3f782acd25e34312921a8eb
104 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a link farm pointing to multiple compromised WordPress sites. These links likely serve as a lure to download further malicious content or lead to phishing pages. The ML classifier strongly indicated maliciousness, supporting the assessment of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://smithmaloney.com/clients/3/32/32eae1a42220421eddab78da2f55685d/File/72002021695.pdf
    • https://cosplay-expo.it/ckfinder/userfiles/files/10409798630.pdf
    • http://aarogyamedico.com/userfiles/file/zulujelowavepugum.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b79c5f8abd5---45681514748.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b05430ba13---79766091489.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160748e6f350c8---zozowufodez.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c7528b9b873---semedupigezorevo.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a31df464ae---gitotomegurarami.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082efdf669d4---79702527913.pdf
    • https://its-bulgaria.bg/files/file/rujomojar.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/c1c9bb67a29e085bfbe34adfaba4f5a2/vusowaripuwakadekifuno.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bf01d6ea588---zezepogotutemabojejawow.pdf
    • http://mofrantech.com/userfiles/file/89020300345.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/6719ecf2d29bf5c98b9e05e68f952efc/82278157496.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/6qqtn3phdc5e8vgibjnpnm4par/35525102577.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/9avns06vlo433m2utlgginc7m2/39372800949.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776d6d9fa53---53208594176.pdf
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/burusijevemudisop.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160920a1c13930---xeliwogirogolexobipa.pdf
    • http://nktrading.qa/file/files/9534132995.pdf
    • http://beerskiboot.de/img/upload/file/1398699397.pdf
    • http://niezapominajkowo.eu/userfiles/file/fewetidegugazesavukozepu.pdf
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/2106081942260775609b8xo4.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9089653c14---goximojitewozu.pdf
    • http://littlepearlbooks.in/data/eimages/file/tasexala.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/h5tcl06vdroigbgl9fa2mbt13p/42534776450.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/2cdc134f290b1cbcb7a8632596724f25/xenelor.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=sigma+cell+culture+manual
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0e2.bin
eb42c3bd7f8835e0ecffae60edafd5cdb8e309387e5bd158c238573c5d7c881c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E2 10460 bytes
font_01_sfnt_off0001089c.bin
57712edaa6b35a42d831e5c1505311ffb4a65b7732359ca62e7ea33d750a6148		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1089C 18188 bytes
font_02_sfnt_off00013720.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13720 16792 bytes

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