Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3028d1b7146bc30…

MALICIOUS

PDF

80.2 KB Created: 2021-06-14 01:23:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 9a472e5f5f981c5e659256555afd8b75 SHA-1: 4113661d0f0f9ab8b99abe5961f2078a2d68655a SHA-256: e3028d1b7146bc3064595cfa17f9be3f5187eacf1bdd6ccf1a80a1b518c9770a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9575

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://krisoc.ru/uplcv?utm_term=101+amazing+card+tricks+pdf PDF link annotation
    • http://apsara.ru/userfiles/file/58317600692.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/m65taa97seduq7lsdf4vkntrl3/solezutomudapavoboguno.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/21440886801.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b34e57503931621b35d43e4335205d0d/sazaxaji.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ea69931fe---85415733905.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/32261648761.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/lqjo6e51csqeuv1nst79p8hme6/34679237165.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/37588867302.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/061c932a1a40d6888480308bfc96dce8/bogepifoterorovapanase.pdfIn PDF document text
    • https://angkalaris.com/contents//files/98920535216.pdfIn PDF document text
    • https://2acontractor.it/images/file/12545790272.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/16085d728e235c---tavekeraj.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5b124f92a---80819159882.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a67ac143e85---gipogivonodokixaseno.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16095bddbbde1d---gikuwivifo.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/bt9vpq8og39tllap6fqvqg1rkt/bedeketiv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn 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_off0000ecc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC2 5656 bytes
SHA-256: 62db0ac017ed1b1c79e95ca25016cd8d9a83db9cdd32730ba45b0e78e610fb90
font_01_sfnt_off0000fff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF8 11136 bytes
SHA-256: 8bc8b1f45d0e7b43d7088c62ddae87cb6a68d927a14be38b678d510e999aa996
font_02_sfnt_off0001260f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1260F 16232 bytes
SHA-256: f260341e2deafef282c0cdf6f9547f7c1575836931e00f2cecf0e77490754097

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