Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5f3bf242800519a…

MALICIOUS

PDF

142.5 KB Created: 2021-07-03 02:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7fa87623cdb529ff0ca5f17ed8bf4087 SHA-1: 164f16a45279905c8fc63aa06d00b95bea1012a3 SHA-256: c5f3bf242800519a7cbcc66ed8cd5d4c3b9337f008cf61e5e08ca372293f12c8
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links pointing to various compromised websites, many of which are hosted on disposable domains or compromised CMS upload storage. This behavior is indicative of a link farm designed to distribute phishing content or malware. The ClamAV detection and ML classifier further support the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9485

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://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/c52ded9e3c910dcf0ac684b12d16a3ba/72724833586.pdf In PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/efl06g5d7554j37fg3b292939j/roboxibuzosaduzexisetinot.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/bjgems7m0ldapo1g1nrt6406eu/xolelaj.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/6tsf84ohf2u67fqhm2hkbrm2a6/zogudotobijufox.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/kepogujorebabopo.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/gopesev.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/lujurogiwudite.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160910b4885326---72736737837.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d3fc00cd0---9428775160.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b3236a81213---fakezavobopo.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d8bc7bc194---vetutoli.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed5f6df6c7---zojedawasadipuxe.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940544dd6eb---wagujusufuzumexonofimagu.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa53c952f1---talonovupusirixatazekuw.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a403b65dfd4---97529792834.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/760728d926743092b497c03dd112e698/kevunonowiniketidatipiji.pdfIn PDF document text
    • https://ckmusicdesign.nluserfiles/file/xavimejefakov.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/ade01e07ed93a8c8c383858d94790d23/buwazarezutimebuj.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747afb2c026---2484374998.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/xawojaxaguzatiledoviz.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928fa8d0c79---53805348475.pdfIn PDF document text
    • http://archimax.ch/dynamic-images/cms/file/xulerorubebesoketeworamez.pdfIn PDF document text
    • http://campcolefamilyreunion.com/clients/82065/File/77925824560.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/motusijezivevosileke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=shun+lee+general+outpatient+clinicPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001887f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1887F 17868 bytes
SHA-256: 467f783f19d50af6bde850c548b2ce0bfa9c0f8bc483c14460a0757d85d61c38
font_01_sfnt_off0001b794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B794 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001cfab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CFAB 10660 bytes
SHA-256: 9f9f99ae25ba5433ee6dae40e147904de392f88d8cc0f60cc047c8a5c6dbd565
font_03_sfnt_off0001e7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E7FB 15296 bytes
SHA-256: ca84df0ccfd9727827af94210a5f86feaa3c874907ecc9f51dd8d19b844e45e4
font_04_sfnt_off00021615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21615 16060 bytes
SHA-256: 8bfc5e2f6383778b4716e60c732a7e5228106b692ca52c1f6b3c0b2892049825

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