Malicious PDF — malware analysis report

Static analysis result for SHA-256 0eb4aed8aed3dc7f…

MALICIOUS

PDF

81.0 KB Created: 2021-09-08 19:35:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7be06ffc5092d191d1d2ed9f82844033 SHA-1: 0e63ad48590f11428fe3509001e518f1e778700a SHA-256: 0eb4aed8aed3dc7f1ba75afcb2571ec1382e6bc9777d353f0e93e9b6b79dde44
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://huntic.ru/uplcv?utm_term=movement+disorders+ebook+pdf PDF link annotation
    • http://kmconlinecme.com/userfiles/file/29319004676.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/44b0bb1dd2abb9a5842816e809a1b807/wafido.pdfIn PDF document text
    • http://jinsonmetal.com/Upload/file/23138192887.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/20833179606.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/74488228167.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/15434251018.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/0c0ce18b3c94d920cf7a151672fcebec/9400271885.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/xesoxesobog.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/tadaki.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/d143e4cda4bda2004f4e1e47afb7652d/bogokejimodijupajoze.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/24870493364.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/640fbafb57c8eb8b73c0d2e0b1f36baf/16365057305.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/lfug64mmnce0u66s41gct6elaq/71349710663.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/fixuxurirazijixe.pdfIn PDF document text
    • http://canadianrockies.info/files/file/17468999021.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/gawopejiximixudusosesere.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/9153897868.pdfIn PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/jokuvopagutuz.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/4093184559.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161343f7a5adc3---37390228391.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/fivevokujegoleza.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/keponenisolakiwiberuvumu.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/56843492067.pdfIn PDF document text
    • http://alacarte-husum.de/userfiles/file/nofufikizajotasal.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021090207321367.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_off0000d6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DA 18344 bytes
SHA-256: b8b0155aafba3177580241fe86c4541cdee27075a578f694bea6c5999c668c1b
font_01_sfnt_off00010626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10626 10740 bytes
SHA-256: 58ed92a7118fad389c96f22b6348131a73400779f67e45695c5f006a1c70fd2a
font_02_sfnt_off00011e9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1