Malicious PDF — malware analysis report

Static analysis result for SHA-256 24c3e9065c6b042f…

MALICIOUS

PDF

83.5 KB Created: 2021-09-10 04:29:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 32d543f04758d0ef95681db83ad8462d SHA-1: 0a1e25873239853e52315a35816a7405dc656d28 SHA-256: 24c3e9065c6b042f9a047314806c474ad164aa343104f272ce38afe7fbe1f109
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://yourbuilding.ru/userfiles/files/kukopurisukaxejowu.pdf In PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/silidizupikawuzosutij.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/xalemivekax.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/10489763162.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/a79rma4p7i51oid26egovvngqf/wepikubudobunolavunavaz.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/73928604541.pdfIn PDF document text
    • http://hoangminhsaigon.vn/@dmin/js/ckfinder/userfiles/files/77786108036.pdfIn PDF document text
    • http://marketingnews.fr/images/file/82907332791.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364b680bb62---fabemoverase.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/a10302bc07d6cc204772f37290359115/35652429098.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/paridejafa.pdfIn PDF document text
    • http://mtkshop.com/images/uploads/file/wiputagazi.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f5f433da4---rejavunifuposuwumexogi.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/13050545796.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/24835998755.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16139c22fa9b0c---51015738706.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/japufuzutolene.pdfIn PDF document text
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/57775116281.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/fiwasufewamuni.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/40824392810.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/80867034954.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/sebesaxapitijanapimukoti.pdfIn PDF document text
    • https://ijpdua.com/contents/files/jetitituxosibijilajajix.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/kudedafofafowilimobuxoni.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/855914304.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/petiveju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=modals+of+possibility+worksheets+pdfPDF 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_off0000dee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE5 18640 bytes
SHA-256: 80a52d403dfe4d4fc6d44235bb0c3c945633fa0633323abea9bc35480949b798
font_01_sfnt_off00010e90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E90 10916 bytes
SHA-256: cf9a5c22fe7405427e74f330d618fce6f511259c45cd09dab069c82e9a7e21a8
font_02_sfnt_off000127d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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