Malicious PDF — malware analysis report

Static analysis result for SHA-256 23918b4fba4136ce…

MALICIOUS

PDF

89.9 KB Created: 2021-10-19 19:46:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 77618ed807bc17ee31f2511218cabe74 SHA-1: afe9a1d53fd2800e4e50f5adaed3120cd5ea2701 SHA-256: 23918b4fba4136cef66cfc6a9f642870dce9fcbecfe6cd2ba9aaff12c3da5375
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript (T1059.007) further supports the potential for malicious actions within the document itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9702

Heuristics 7

  • 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.
  • 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 http://akvarium-olbrecht.cz/upload/file/nuzomujodirakudiveneri.pdf In PDF document text
    • http://0851gay.org/userfiles/202109file/2021092603473370554.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/mosamama.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c9f563fb0c---60786126093.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/27068683823.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/polugo.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/10317150639.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/76704703641.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/zemaloju.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202110041826548640.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/wodesibuwifexo.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/a96c5b8ef39675df6c907da49f7cfb8e/53827566757.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613901a5b15a9---81864422000.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/zesan.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/mukutizabolevoga.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/birefuxox.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/watusizijewuzibawof.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/rujimawuwiga.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/regisigufusi.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/nefegikefed.pdfIn PDF document text
    • http://paulabenveniste.com/UserFiles/file/62120428540.pdfIn PDF document text
    • https://unaizahic.com/Files/files/turarofaruri.pdfIn PDF document text
    • https://placute-frana-dispaco.dispaco.ro/userfiles/file/81033944268.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/setenowomur.pdfIn PDF document text
    • https://aqua2go.pl/galeria/file/33951713700.pdfIn PDF document text
    • http://finance-bulldog.cz/UserFiles/File/88655984485.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/5bhJmFgkeCE/uplcv?utm_term=cs+1.6+oyuny%C3%B6neticisi+aim+cfg+indirPDF 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_off0000d494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD494 11520 bytes
SHA-256: 4a059b75dd1f4c11b89de080732a3a2c0bbcb7b8371fe1bbddf482c9362e4285
font_01_sfnt_off0000ef6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6C 16436 bytes
SHA-256: fcbfb16bc6cdb054ba45eb83f59888141a23265fd00251411cec750773377055
font_02_sfnt_off000105b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B2 19716 bytes
SHA-256: c8f75694840fc8ce48c70e551ac43db912363133d7cd47b6d4b97e4f5da55a29
font_03_sfnt_off0001363b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1363B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00014e48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E48 1732 bytes
SHA-256: 5b3c947262022625ef2d4cfb2d0fa10a94f23c97611fd4c7364bfcc62a76ce6a

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