Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe5a0ea2beed9102…

MALICIOUS

PDF

131.7 KB Created: 2021-09-18 00:20:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ba1f2747a345bf4bd6513b4f40aee190 SHA-1: dcef1c97e9ed9e12d654a263ecc1cf6c5143e336 SHA-256: fe5a0ea2beed9102eae9d9dd0e8c1bece46f22182aa6883fd067177fe1be7cd5
252 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or deliver malicious content. The document's content and heuristics indicate a lure for recovery secrets, likely to steal private keys or backup codes. The presence of multiple links to potentially compromised WordPress sites suggests a phishing campaign aiming to harvest credentials or sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

Heuristics 10

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/4be909f1fdf477df1c75cdbd048904b4/71141529710.pdf In PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/fodekikusefuvabarovuma.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/35338330520.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/torodozebamobogekepuged.pdfIn PDF document text
    • https://brakos.it/file/87055755170.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613574c98369e---45087405964.pdfIn PDF document text
    • http://ph-easycome.com/userfiles/file/kekeg.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/fowiwimubev.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/godaxoriwufowizumaruzitef.pdfIn PDF document text
    • http://creationart.hu/files/file/fofopuluzivi.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/8c78b7100aa0fb0dca1828d1d65cba83/6808851106.pdfIn PDF document text
    • https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/vepuzifezuped.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/78733390934.pdfIn PDF document text
    • http://belniig.by/public/file/90476917911.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210907_70058E2A4DC9287B.pdfIn PDF document text
    • https://sskundal.com/userfiles/file/wuxovabaw.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/161447bdbaff7e---bepemazekagetedox.pdfIn PDF document text
    • http://samafb.org/uploadfilefiles/saxozivi.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/ruvasonusavijit.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/tagibokotukidizi.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/63024265106.pdfIn PDF document text
    • http://miass.realxenon.ru/uploads/files/vorelukakurobaru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=qr+code+scanner+no+adsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001795d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1795D 17584 bytes
SHA-256: ddd5eef3d1f70f60d94066311c16ed2f6f54a92df187a127e7180cd535b93a61
font_01_sfnt_off00019403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19403 10184 bytes
SHA-256: cb3bd1f542db788a5c2499e720905091427655506e4b1a17e4dbe4b5bf034b45
font_02_sfnt_off0001aaf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AAF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001c30b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C30B 23464 bytes
SHA-256: f697718e7ad62814aa6c6533344a6592613d08c42e8de8f2952ccd7e562b1287

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