Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c708d309b0e207d…

MALICIOUS

PDF

86.5 KB Created: 2021-07-07 23:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b332204e657d13470e0eef7421115011 SHA-1: 13012b4f7e0e0c42cfbb61136f8174c5b924cf9a SHA-256: 6c708d309b0e207df47116094ce25e7147e7b87b4f345cf7d428eb0333a61592
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress upload directories and disposable hosting domains. This behavior is characteristic of a link farm designed to distribute malicious content or facilitate phishing attacks. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://specimport.by/files/files/33099235180.pdf In PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/0539c3026dfacfa254b44d4f77e1d28f/35114062505.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/41616690545.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/dc6b046967028d2df2d7e18160f1c70a/1595718887.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/a1a3b183d9c5bd4e0e3fc69adda5fbb9/63572161426.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/77322229596.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3b60208b5---28263496658.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4038289494---46398756858.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/7c903ba119252579845f8e46affac23e/xapuwofaxafi.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/86f623a56cd1ceee43ff31cd09671220/gaxidekijinel.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/116115735460948eda9e1cd.pdfIn PDF document text
    • http://bakoca.hu/files/file/98555481991.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6b0061ca3---potetemezunida.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/bikivuxedil.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b9a2975db---legupa.pdfIn PDF document text
    • http://yalciniskele.com/imgup/file/41084866520.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/39627285839.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/91394297595.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a62aafd1cf7---kuzekogagarivetiwe.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/31001783655.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/97de39cb35a0a598fa2c165e950c0daf/dapofex.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/17f436222ffe2091b2a260fe179812ea/28138539415.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/b1798c902589446efad5b6fe7d135546/dubufewigemobidimezuza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=reengineering+hammer+and+champyPDF 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_off0000f253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF253 16736 bytes
SHA-256: 0ce805df93a400cc22e725cf43c3770aa0a3e8dc74875cf4cc708125f8da44e8
font_01_sfnt_off00011df3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001360a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1360A 10688 bytes
SHA-256: bac3f64848e8888ae9eff49a94875c0d6842761362fd8e0e74682b34ba666762

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