Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e80c0dc8c7b98f2…

MALICIOUS

PDF

87.6 KB Created: 2021-07-01 19:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 61df5a13839a4b7625aa5f76f4cf2bba SHA-1: 29281a50a7e80df2345bd71a4cb95d7fc9df2c3e SHA-256: 4e80c0dc8c7b98f278f6b8c9f01c6af0c9a6f391b4b83a3f2456eebd5877a018
96 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous compromised WordPress upload directories and other disposable hosting sites. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of external URIs and link farms on potentially compromised or disposable hosting. This suggests the document's primary purpose is to redirect users to malicious content.

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://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160ca48a11d3ed---40254915470.pdf
    • https://textolinguisticsolutions.com/upload/editor/file/zalarini.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cad59f180b6---91796736115.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/b1f967b6adbc5d435db09be6ba65c3cd/radizagupamorabojepegodo.pdf
    • http://maekuangudomthara.com/ckfinder/userfiles/files/85090494448.pdf
    • http://krakow4you.pl/krakow/files/wofefelaz.pdf
    • http://blatt-gruen.ch/files/17546198654.pdf
    • http://carolstoecker.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/kasipodetiluwibijosasafus.pdf
    • https://arichaindia.com/userfiles/file/xurimojosudax.pdf
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/nuvebatojomes.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a97c43d5468---8975847621.pdf
    • http://maynenkhiinverter.com/media/ftp/file/rinijadi.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/o9vgoia5c2pmt8sd11gdkcoa90/48261129477.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/8043dd022cf3bb82f06c2df9e525b9c0/40816295406.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/d5cb026c8d5a5fdef4e5ca933795d9bc/xeputuwuzasorodem.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/2a9cc85bbbe0441bbde0c838a403c35a/31232565298.pdf
    • http://sskj.pl/userfiles/file/wivuso.pdf
    • https://koncnc.com/genelresimler/file/91583432512.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/f9703fd1299bc3acd60c8e0c65ba5bcb/wagilarojunapo.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/18fc004a6f6c1bcf3c0c0f280187705e/komaxotelefawi.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160799dfcbd38e---50016354995.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/be338d36e474f0e044ecf278ad74a86a/wijovesekegeneju.pdf
    • http://puppies-4u.com/clients/e/e7/e7f09595da74c05d2059c741134300d2/File/82616542212.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b10c18161a5---dekawopufulog.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/5d752481eba7c467e5fcfcf678877936/vitopuxemanodanipid.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=the+knife+of+never+letting
    • 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_off0000f65e.bin
9a8eb3426fe6ba90d7f93fc6f5318eef195e6840367d7316370bc92f581a0d3f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF65E 10284 bytes
font_01_sfnt_off00010d73.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D73 16792 bytes
font_02_sfnt_off00012585.bin
a8d58f5a30e91d9e1de18bdcac928d6e59371cc3ddd757a63cd4bf522bf47352
pdf-font-stream PDF embedded font (sfnt) at offset 0x12585 16616 bytes