Malicious PDF — malware analysis report

Static analysis result for SHA-256 21aabc425c374dd6…

MALICIOUS

PDF

80.5 KB Created: 2021-09-18 01:35:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8b899b240593c9585368799c602c762a SHA-1: c60dd6d09dd456975bd9ab9a9d129036501f3fcc SHA-256: 21aabc425c374dd6f062feecd57a6e706be49514efe626f6b3daf4aace675361
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains embedded JavaScript and multiple external links, some pointing to compromised WordPress upload directories. The document's structure and heuristics indicate it's designed as a lure, specifically promoting the installation of remote support tools. The embedded JavaScript likely facilitates the exploitation or redirection process, contributing to the overall malicious intent of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://career-id.org/ckfinder/userfiles/files/52421167151.pdf In PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/lerawavugasofufa.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/42396693414.pdfIn PDF document text
    • http://newgoodluckcrane.com/admin/uploadfiles/file/30766743261.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/gumimugezur.pdfIn PDF document text
    • http://cichanski.com/Upload/file/texilo.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210913_6762D6C74D0EA2D2.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613700b473020---61484993480.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c68e929075---66038228490.pdfIn PDF document text
    • http://huynhgiabaohotel.com/uploads/FCK/file/zotidivolalovodajuxe.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/93149365093.pdfIn PDF document text
    • http://addisonplaza.abwingsmd.com/uploads/files/javunikukibilejasewefere.pdfIn PDF document text
    • https://cape-electronics.com/media/file/6861141086.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/xadute.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/15358090387.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/fefofizutexuvizodiv.pdfIn PDF document text
    • http://jenistudio.com/upload/FCK/file/1429430994.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/wifiwuviri.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/74681218655.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/52380245034.pdfIn PDF document text
    • https://gerbangkuis.com/contents/files/rixodaleladojawupod.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/senutikafajet.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/51358350604.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16140931937c83---10984259865.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=remote+access+android+tvPDF 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_off0000d5a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A4 17880 bytes
SHA-256: 5b8bd0f641dbec0d6ddaf20bff94dbf5e3258b8ffa682dd13abd185c6d2d4af0
font_01_sfnt_off0001045c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045C 10596 bytes
SHA-256: b9e3e1071a0250ef40cda7acf98c0d2c57e83e83b9e995aefc04ba8b8cec6dae
font_02_sfnt_off00011c9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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