Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3dd3abc7a786eab…

MALICIOUS

PDF

76.6 KB Created: 2021-09-05 13:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c3776cabe6a4eee149fa4c79f68b8334 SHA-1: 10fafde998721ab5830799898fdec76f7e7b9b37 SHA-256: a3dd3abc7a786eabe4b92f2529229749f0f6b04667ae1d8b604676881a723363
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier with high confidence. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of these links suggests an intent to redirect users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://chcial.ru/uplcv?utm_term=attahiyat+full+surah+in+pdf PDF link annotation
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/50728508951.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/97771836539.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d25174e7dd2---suzazijexojupi.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/84838108653.pdfIn PDF document text
    • http://thaide.org/userfiles/file/sisukezituza.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/78568483756.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/sajet.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1626253845.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/8dbfdafdced88d257851d06e17af72da/211326177.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/81971a32d1bfe41ce24d103ffcdafbd3/45563141222.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094acd2d585c---35734107346.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/degegubirikijikepakulila.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/k4njgcvhpg4lfcee927kir623h/domerarizejej.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a6902b037d3---funaveva.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/lefinigemuk.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/a9bpf3a73tqmismkehars1jde1/dutubili.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105070259204972.pdfIn PDF document text
    • http://josephlillianmorrisfamily.com/clients/59960/File/bovewowa.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/a299029482b01215fc0cd865309712bd/4987200032.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f37c275fc8---45463987222.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/xolemawolazegowimokesiziw.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccfce59edab---96363514212.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/904ec5df941ec75836385b8601fdad84/roridesivalopo.pdfIn PDF document text
    • 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_off0000c0e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0E5 19600 bytes
SHA-256: e2db00a86c32e660573b60bd029a0216e4fcccafc41f5cc3c56f9bf18a264426
font_01_sfnt_off0000f466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF466 10540 bytes
SHA-256: b3fd872a3ff1688b9e29514ae1064aeecb96dcfb64aee3e598c88ab12d583c63
font_02_sfnt_off00010c5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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