Malicious PDF — malware analysis report

Static analysis result for SHA-256 c24bae561ea17f9f…

MALICIOUS

PDF

86.2 KB Created: 2021-08-13 10:23:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: b1846ed8b5f9045268629e1346a37a49 SHA-1: e0e9a9a6ae312ae344d25b85172a8965766db2d5 SHA-256: c24bae561ea17f9f3729dbc4e4a83481d1b2d15319994674adf893eb87344fee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external URIs and link farms pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The document body was unreadable, but the presence of many links indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://coretry.ru/uplcv?utm_term=the+king+of+fighters+2002+magic+plus+2+apk+para+android PDF link annotation
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608663f8a5d2c---malugubunasotupoz.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/6467937522.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075bf97913a2---53145446396.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-08-04/images/files/gigipugozi.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/431540712.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/94084957865.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/vugorakarolibatamav.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f39057132---54177497671.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/xajovoturuwebav.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/tcgriqua9c6ql02bgsuoi9fio1/zadelegegedipagomopuwak.pdfIn PDF document text
    • http://mayfamilycircle.com/clients/5/53/53cd9f4101e72b768929e5daf979c2da/File/88434221105.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/q9m8j2vps2859ct4vk7munkg01/bumodinogomixo.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/66780992127.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/futabafojowa.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/96463472399.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-12/20210512110739344619.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/d78ae022a68a7bb0ea4e5f37a4b5447b/bewevilekedenipusikawa.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/12124630490.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9943d8c2a---67508289686.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160878a054fd79---gitamovinu.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210626_065305.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_off0000ec34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10446 16588 bytes
SHA-256: 8d81e7c5da529bbd8426375362c19b394a2fd8c305fb6eb4a395edc35f65d94d
font_02_sfnt_off00012f32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F32 11464 bytes
SHA-256: c01ba50d91f99abd1cdde3cce29c9a0c3252c618ae9c0db138b1a47552f29a8b

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