Malicious PDF — malware analysis report

Static analysis result for SHA-256 32ef2302d5bec396…

MALICIOUS

PDF

72.6 KB Created: 2021-09-18 04:31:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 911732a7e75851305e7050934f49f48e SHA-1: 0e09afbaf0d51ea745e717c9a43659f418a1c314 SHA-256: 32ef2302d5bec396bf2b197b53a5d9560528ede26fca0b3c8ea3dd02718fd374
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress sites, disguised as a download for a Minecraft mod maker. The ML classifier strongly indicates maliciousness, and the structure suggests it's designed to trick users into downloading a secondary payload. No scripts were extracted, but the link farm and compromised CMS upload heuristic point to a malicious download lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613061b88c851---siweputukuduwofujetizezek.pdf
    • https://www.canoe.ro/Extras/ckfinder/userfiles/files/vafixitasavanajo.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16134f02a1923d---63743352505.pdf
    • http://j-club.eu/userfiles/file/sovasawazo.pdf
    • http://stellarp.com/userfiles/files/kizoxi.pdf
    • http://leebyenghun.com/new/upload/board/files/70709571237.pdf
    • http://sushrutproctology.org/ckfinder/userfiles/files/rumafovavitoterekapimot.pdf
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/zomivefujike.pdf
    • http://coumert.com/images/file/42018940874.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614532ead36c9---fawotalatinizupesur.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161426708e596f---56803359000.pdf
    • http://tokyosushilohaus.com/uploads/files/luzugoxalupik.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf48a405b3---920682642.pdf
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/65010954149.pdf
    • http://slxiang.com/v15/Upload/file/2021971659161342.pdf
    • https://maryamghiasi.com/images/upload/files/weturesedopopajez.pdf
    • http://andreaslasnik.com/data/files/revijo.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614091951bfd3---gotavuxuxulubuwasabeg.pdf
    • http://nanouklid.cz/upload/file/pojijujakanesigew.pdf
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/madibixu.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/j4585jrm96m0hhua8b9geccqf3/12540245411.pdf
    • http://abaj.cz/UserFiles/File/14826273736.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401a7cb65b9---juzemubudunofikonufesozeg.pdf
    • http://mai-colle.jp/userfiles/file/51064588537.pdf
    • http://jiachuankeji.com/upload_fck/file/2021-9-7/20210907165034760964.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=download+addon+maker+for+minecraft+mod+apk
    • 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_off0000bba7.bin
8d781de1b8b6e728a70a9d09ce7e0073dff6125b5d0471d8f47435b592f7f929
pdf-font-stream PDF embedded font (sfnt) at offset 0xBBA7 15700 bytes
font_01_sfnt_off0000e39b.bin
b09b9332a04c93b2c37f88c708740e9f2df97fb34f415f5481579b0705ff77ae
pdf-font-stream PDF embedded font (sfnt) at offset 0xE39B 10792 bytes
font_02_sfnt_off0000fc73.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC73 16792 bytes