Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e0430b59f2556eb…

MALICIOUS

PDF

77.6 KB Created: 2021-09-17 01:36:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c5c48e326fb80bb7d8031cb4e1fae0fc SHA-1: 4bf39f490402c4d0f6ebede67495427af71c4cca SHA-256: 8e0430b59f2556ebfa77f539fc54dee7ee1550d0971f8c53b44d662678f01033
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript (T1059.007) suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=android+toolbar+hamburger+icon PDF link annotation
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/8dddd0f54aeb6dcaa73ab53328edd941/gelumugudix.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210902050353_1658564135.pdfIn PDF document text
    • https://hsse.cl/files/xikilobaka.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/73829627295.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/58858680744.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210914070302.pdfIn PDF document text
    • http://yjeverspeed.com/userfiles/file/67958477102.pdfIn PDF document text
    • http://matrix-corporation.com/upfiles/editor/files/11770699883.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/64422669270.pdfIn PDF document text
    • http://alatasfilms.gr/ILC/img/file/51334587136.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/bezimid.pdfIn PDF document text
    • https://laser123.com/geektic/files/58090704607.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/30667040641.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/61926030531.pdfIn PDF document text
    • http://unityproductions.com/upload/files/guwiwuleros.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe6326cf6a---42561368173.pdfIn PDF document text
    • https://gestcargo.com/uploadfiles/file/galupuzopoludefa.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/71104853557.pdfIn PDF document text
    • http://rjt1.org/upload/files/36632257268.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f43047f101---pejesaverofujetuposi.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/ccd0721ece0658d09ef1724fa4bd3c82/97250857618.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/25435280559.pdfIn PDF document text
    • http://kite-surf.sk/files/30056994995.pdfIn PDF document text
    • https://sofupingame.net/calisma2/files/uploads/93195773797.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_off0000c73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC73B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4D 18340 bytes
SHA-256: 2be221d8f53488a61f86fb6c4048a02a1fa3dca430921b1acb1f774812c3e80e
font_02_sfnt_off00010fa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA4 10872 bytes
SHA-256: c08da49b46f9d765e04e7940ed69721895f06a863b82a170a28f5a2b11b628a0

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