Malicious PDF — malware analysis report

Static analysis result for SHA-256 8705438fe9e83bc0…

MALICIOUS

PDF

84.2 KB Created: 2021-07-31 07:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f14c471c46ca69fd6fac4b2eeb377c4c SHA-1: f6cf35ca4fb2948c9d5c00deb22a5dca89871616 SHA-256: 8705438fe9e83bc0a4bdf72d7a031b87761c2d8d2e28e20832244ecc092d24eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains. The primary goal appears to be directing users to potentially malicious content through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/76e2753e70897384ddcc86e050b6b0a1/misusarezorenir.pdf In PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/nizunofuvik.pdfIn PDF document text
    • http://carolstoecker.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/guguwexogedona.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/sudiwu.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/911384941.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/49170296602.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/b5ae2777f61d3edca9f9dee083043aa6/90110453739.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/50830264946.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/jewokoruwarutuseni.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a641a3ee6e2---16462738602.pdfIn PDF document text
    • http://neonyazilim.com/images/Media/files/29852096326.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/26qd4kg5942hn2mv78iqrr4evt/53465692358.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d9a3f23a77f---35499199863.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/voxibijawabubejokirakur.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/eb0ecbd325f761446d7f01862ad8e7c7/tapumi.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082c18283787---bojenumupepisu.pdfIn PDF document text
    • http://itssilvertime.com/clients/2/24/24efe347a73a8ce028152bf895bc11a7/File/33543968977.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e790bd0ce44---jowevenim.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608800ab2fd44---xamizijujedadotenusun.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/3052632f69185f4c73c1bc06a96fdb53/molukonasujolegudokaw.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4072bf394---bunijokizikukagevipawi.pdfIn PDF document text
    • http://soflocops.org/clients/83264/File/wasebediluwikonezulamixog.pdfIn PDF document text
    • http://fabtur.ru/upload/files/zawubivamig.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/zisagiditidifimatup.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/86300568737.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/balago.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=discrete+mathematics+with+applications+4th+edition+pdf+redditPDF 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_off0000e3b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCB 11052 bytes
SHA-256: 94d25f72a3ae96a063e51f6c33802904777138886941cd250ee181b8260f0002
font_02_sfnt_off0001156d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1156D 16996 bytes
SHA-256: f6d8d815035b457d3689f75166b4d678313323a54e77500cfe643300c3db3462

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