Malicious PDF — malware analysis report

Static analysis result for SHA-256 344647b98d3f082d…

MALICIOUS

PDF

81.2 KB Created: 2021-08-19 23:52:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 101de6155aca8988016e5f41d79df395 SHA-1: cb60c5dc5fb3f68f5650e1714d5531bdfac887c7 SHA-256: 344647b98d3f082d5d18af94ad63a249114da020a525492841e950343f887e69
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 CMS upload directories or are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://pixomot.ru/uplcv?utm_term=how+to+do+an+earth+resistance+test PDF link annotation
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/ce105105d64bd57283168aa6bf14caf8/walijukoguzasizodemedat.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/28186923378.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecad51fee8---44950903142.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160923f7d3c628---22313268238.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/1b5ceff465d07111afc4a073be4d118f/vujilakuxo.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/38919346108.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b47cd0b38---tixuvuxapekajelo.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609899893c469---jenuravaterujimi.pdfIn PDF document text
    • https://loyallcanada.net/editor_files/file/pesulemejemivanaju.pdfIn PDF document text
    • http://gibisch.info/files/files/4922648228.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b61a21651---68005632221.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/lonupexeb.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/sccmj5mhio2atg1b53kulhnd1s/33293740494.pdfIn PDF document text
    • http://sutphinsgermanshepherds.com/clients/21958/File/80558653017.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d537abe54a5---jutidiwudujukez.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/zazufugofilamaduwezadak.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/98031604825.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/jmogalh9omshlu2pceura412lk/xoteren.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b99bbb721f---semafitexadogexi.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/7830116473.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/67904126631.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/6298477838.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/d42e656e3411f5a1c00917aafbfe4429/5221278611.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/livufaguzefarewiw.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_off0000dcb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB0 10496 bytes
SHA-256: 0815a06d255f8cac6e0706384190ffdceb171a47a1277ad5c13ef66dbed58378
font_01_sfnt_off0000f484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF484 16408 bytes
SHA-256: 1ef270d6f27ffa043f196ad75aa80b566f85003420f3360cfe21a71a9334df50
font_02_sfnt_off00011ee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1