Malicious PDF — malware analysis report

Static analysis result for SHA-256 de1f1fbc5036d99e…

MALICIOUS

PDF

70.9 KB Created: 2021-10-02 14:52:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0217cc26caeee9672c684c53c3d92929 SHA-1: bde9e7600e9e1d7bfa2677d8003aa995fe938ff8 SHA-256: de1f1fbc5036d99e7e6db31bee0873bdf4b3541420befc3b3680bcd36be4f396
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. The embedded JavaScript stream and numerous external URIs, many pointing to compromised CMS uploads and disposable hosting, suggest an attempt to redirect users to malicious content. The primary purpose appears to be facilitating phishing or malware distribution through these indirect links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

Heuristics 7

  • 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.
  • 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://medicamarsala.it/userfiles/files/8788172163.pdf In PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/64906371846.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/48980757249.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/bikanurefajuzibigu.pdfIn PDF document text
    • http://sake-tori.com/images/library/File/23632572394.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/50651125388.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/54510141121.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/sozanonuroziw.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/ratewuj.pdfIn PDF document text
    • http://olivetheater.com/userData/board/file/58149787663.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149e309760e8---69474862751.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/19394546255.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/fojunugiwaluvulugokiw.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/labalivedajumujesoviwud.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/nonelidimuwonafatiju.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/lupetofolireliwejibexot.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/9328251422.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/firim.pdfIn PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/67323994434.pdfIn PDF document text
    • https://neurondevelopment.org/userfiles/file/37051119253.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377c10bed51---todidawedimuba.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613a99ecf2582---41675021443.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/fvgrei5rlhcbtgqk7co8m4sick/gasaxegajokuzagunuzerixa.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/36589806956.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/pomedifajogisufoj.pdfIn PDF document text
    • http://kawana.tech/userfiles/file/lajijabopimusaladuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=periodic+table+of+elements+1080pPDF 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_off0000b37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB37D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8F 15668 bytes
SHA-256: 595022fabe3187559edecb8eb760fc918fece255956e986b6a72129556599bc7
font_02_sfnt_off0000f375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF375 11304 bytes
SHA-256: c024077251def1d01a2ee8249345bc87c130831caa4e930e20c88a23b49dc78e

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