Malicious PDF — malware analysis report

Static analysis result for SHA-256 51cca0b30a57b431…

MALICIOUS

PDF

88.9 KB Created: 2021-07-30 22:41:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9440e50243eea0e51c6cca9713d2cc76 SHA-1: a7c0dcbde5ab4d774e3828b72743f495ebf59d13 SHA-256: 51cca0b30a57b431ae7332f91ab8dc2bd46f28b9484173c3272bf9a63cb5b8dd
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The file is a PDF that contains a link farm pointing to various PDF files hosted on compromised websites. The 'SE_SECRET_RECOVERY_LURE' heuristic indicates the document's intent is to trick users into revealing sensitive information like private keys or backup codes. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • 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.
  • 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://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b66f1ed24---44853008561.pdf In PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16078a1a7ec0c3---70413119509.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/wevudapomijubizu.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/69891875054.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/pv8i40u0sv95gh99843u9jtv56/gejasasawizirum.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b75ddb1d5ec---ladapidibinotodusizat.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/8ce108ead25fe8f94a9f1d811282265c/42895439552.pdfIn PDF document text
    • http://davidlbrooks.com/clients/868292/File/lixuxodiwokowojib.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/85726521649.pdfIn PDF document text
    • https://topaldanang.vn/uploads/image/files/rixevizu.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/e369cbdeeee9db8af10e61b49f85635b/93499974690.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e088f0ba30---18933967776.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160753f30df5cb---jizaxipanewiruzuva.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/tudaluj.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/bewonametijuvizilab.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/57510568320.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/18399095185.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/i0k95evpuede0213m5bv1b7dmt/69673349475.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb22263f6f---80814297148.pdfIn PDF document text
    • http://digemnd.com/UserFiles/file/pagonubagaketedesivexexa.pdfIn PDF document text
    • http://bigsvatcharasith.com/userfiles/file/dufujitenizolugulofopugek.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbc34d6339---60579521223.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/87070286495.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=daemon+tools+lite+license+key+free+downloadPDF 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_off0000f77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8E 17420 bytes
SHA-256: f6365ebd4afd384c3be710f44b65892bfe987574a471f952f62510e4e5b387ef
font_02_sfnt_off00013c7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C7B 10928 bytes
SHA-256: d54f3b53c863b4622e4cacc5076550f5b8998f373c78684deb8374794ef5a53e

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