Malicious PDF — malware analysis report

Static analysis result for SHA-256 136ba574cb86f232…

MALICIOUS

PDF

92.1 KB Created: 2021-07-31 06:59:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c160592e8aa03d4c2126c40bd51edf2c SHA-1: 8835753dcc3c3c2929c0a45d755f62a7443da495 SHA-256: 136ba574cb86f232d2f82da76da5b5aa90ad49c4bfa3674b268bd9368dc9526f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute traffic to potentially malicious destinations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/bdljte37ruu84asn4akabvkfmd/litulufi.pdf In PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/0099832b935d570b923bbd68f99eed50/77007703998.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e2a78424b---xibewizofifabubupilome.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/877f4362fd3ad78ab93f77da0a4c0db8/beberubopodanulujopato.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/19324633674.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16080ac4dbaad9---12438101143.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/6628c574f7881d65da72c231e993b62e/6020067708.pdfIn PDF document text
    • http://fitviewer.biz/files/file/91611344091.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/89e5a3eed63e6c5d94876dc741d283e4/97643581948.pdfIn PDF document text
    • http://sodrex.pl/userfiles/file/revimodapuf.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/74945443756.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609b124d905fb---30439563231.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16075aaae1ff38---gonuzawam.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/2ecc9aeaa74821f776cbb816825b6846/bumuwaxizazaja.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/porug.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/46709375952.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d4c72c81a---gadorukitokazozarepiber.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/48376528460c54c83412f2.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/gischjog6qhgnlugeoq49ojs45/78352580835.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/56338227373.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/wuranogitupekowebij.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/zogefuritewefisapomukuki.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/27758762648.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/wavidufad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=tillit+power+plus+motorisert+tredem%C3%B8llerPDF 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_off00010198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10198 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000119aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AA 17680 bytes
SHA-256: 3ac4625cabe67c1cd07f42878e6bd6b0cfeaa474bf49608e5443f3164453d6ad
font_02_sfnt_off00014749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14749 10616 bytes
SHA-256: 822c66b3c31e4f0cd90f85597b52aae2c4e9931d97184775dac41ee2c9f69d40

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