Malicious PDF — malware analysis report

Static analysis result for SHA-256 31496b7276ddb15b…

MALICIOUS

PDF

83.4 KB Created: 2021-09-17 07:04:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d12e15f318616311f7a7572e126b9d86 SHA-1: 1ac943b254133d8833314946fe35bc2b5362c381 SHA-256: 31496b7276ddb15b1a12263e0e2b5db9c100a542c481e2e1ce4d38ba4ea8da4b
196 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content is designed to trick users into installing a browser extension or update. Numerous external URLs are present, including links to compromised WordPress uploads and link farms on disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the overall pattern points to a social engineering attack to deliver a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://allytemp.ru/uplcv?utm_term=what+is+the+home+screen+on+my+phone PDF link annotation
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131aa3d55eea---bekalukusudaguxuboja.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/xifivusikovorumiwalenewok.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/36968876963.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f119ee32c1---tikesorekawotololasiji.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/161435ffbea767---85164628802.pdfIn PDF document text
    • http://lokalizacja-gps.pl/userfiles/file/losilibabozedafekivefu.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/3b45fc37426d39d5cafc4ab46d5291a0/pisotizo.pdfIn PDF document text
    • https://sdudyogtechnologies.in/ckfinder/userfiles/files/34356102986.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/72623361509.pdfIn PDF document text
    • https://panoramamall.bg/ckeditor/ckfinder/userfiles/files/97061279107.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/24945317333.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/40250225057.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f5f65854f---sigixuzakegana.pdfIn PDF document text
    • https://inprovitmexico.com/ckfinder/userfiles/files/57866476446.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/56361897660.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/25173751475.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/lorojikikawomonolevupixo.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/85018494507.pdfIn PDF document text
    • http://daivupaint.com/img-chamthi/files/xawibejodojaledanenabo.pdfIn PDF document text
    • http://glassick.com/userfiles/file/kitulobare.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/niverawanelirujelutiwutu.pdfIn PDF document text
    • http://dfanchem.com/upload/files/laxikalavejojopu.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/dimapibif.pdfIn PDF document text
    • https://conviviodihera.it/dati/upload/file/79867147440.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/23658650392.pdfIn PDF document text
    • http://madurastones.com/userfiles/file/50522460718.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/lajopomolabazedumabas.pdfIn PDF document text
    • 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_off0000df62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF774 18532 bytes
SHA-256: ea480a4132a41939bb47a948b94cd0275f190fc23c2a8acfc25e360b4e5251b7
font_02_sfnt_off0001271a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1271A 10700 bytes
SHA-256: dd2205a05a9a50690505016fba898ba994a06bd054df7362f2f4ba92df22e6b2

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