Malicious PDF — malware analysis report

Static analysis result for SHA-256 19c400db249569bc…

MALICIOUS

PDF

74.9 KB Created: 2021-09-06 07:50:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c40b9c62d399275951159e31c248e93c SHA-1: 1c3ffb9fbfe5a050c29c9bd351e05b53b6e56a06 SHA-256: 19c400db249569bca4cda2c747d164582c51db28f3fa8fc2eb11402faa644906
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of PDF link farm heuristics and the overall detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://raiporjai.com/piceditor/file/jexogusivokugik.pdf In PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/8sece15aleuorn6lb0mvrs7s05/vakuvowubododapafowapaf.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/bijubafabufigegufejidis.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e251adca4---73076744735.pdfIn PDF document text
    • http://immopolignano.lu/images/31483005305.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/9a34fb2366da8e2c08932a721444e333/54245577859.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/tutezigalopopodifepa.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/dgajp1d5qf9ud7h0ltp9le19j1/30119217802.pdfIn PDF document text
    • http://millecolori.it/images/file/binefuwuw.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/d6ad173b7bf8f073c035b75829ec142a/gomug.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/60b01e82769b9.pdfIn PDF document text
    • http://diamond6ranch.com/userfiles/file/95813917551.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b66e36a22---lulevikapefonojimolegok.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ace435c0a9---jejaluxozakitu.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706fe8b0c05---60574252182.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160968e088c0a0---5452025149.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/75081088815.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/50960386617.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/rukodojonomubokugami.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/2641c48bc3bde973ec8b04112123892c/labofokowegiv.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/wiwinini.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/95585906733.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/85614364362.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/10412432835.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=global+competitiveness+index+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_off0000c33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC33E 16120 bytes
SHA-256: 05389347a774d41fa1f8016f8092bc49cc9ed6ae23b3aec38cf47cf4d65bb01c
font_01_sfnt_off0000ec86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC86 11028 bytes
SHA-256: 4d3199bfcf022b08f28300af13de4fe3a6a997456a765ee431cc8519016891d4
font_02_sfnt_off00010602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10602 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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