Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c8fedc48576ced2…

MALICIOUS

PDF

85.4 KB Created: 2021-09-06 05:02:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 428ec83c652e68e2c5c58ea281208bb8 SHA-1: e71b7adf0b7dc02deefb197acf66e316fe9952d9 SHA-256: 9c8fedc48576ced2748fb0ddedcf4e174b3ceca7433b82d552018d2f11763817
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites. Several of these URLs are hosted on compromised CMS platforms or disposable domains, increasing the likelihood of them leading to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fitviewer.de/files/file/77484412119.pdf In PDF document text
    • http://diversecityuk.com/userfiles/file/28088489646.pdfIn PDF document text
    • http://zimaletto.com/uploads/file/kexuz.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/50798060497.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16130d781be4d1---kabuzix.pdfIn PDF document text
    • http://timebymtm.com/upload/files/9366640878.pdfIn PDF document text
    • https://warungmimpishio2.com/contents//files/97243569013.pdfIn PDF document text
    • https://noventa.cz/media/files/file/jiruvegesebumajes.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/zojotejetadokeditexaposol.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/luxuvanevalesaziwi.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/b0b1f801e386856913883c589fb72cc8/20118447225.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/doked.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/39010172621.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/guzeviwemuvunidebis.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/114757820fee43788e682ce28a6d6893/danosizikapon.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/34229660965.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/meramo.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/v1gjlr685q7u2im8nsvhrp6ilv/pefinatebefenotogikiwarux.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/51601310268.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/2f18f2af4c385c19b9c4c8317efdebdf/98634915022.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/42440229451.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/kerativilaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=entrepreneurship+innovation+and+business+clusters+pdfPDF 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_off0000e714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE714 18108 bytes
SHA-256: 967ff94651cc8cf5a465138c049aee0832b50d8c01907874c51f5687de3802a3
font_01_sfnt_off00011683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11683 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E9A 11008 bytes
SHA-256: 21f10b392026ca88025b6fd51428bee93ecb9745d6a4f4cbd59378f90f79cd70