Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e14bcc6d7b8252f…

MALICIOUS

PDF

69.0 KB Created: 2021-09-17 13:11:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 14627a63b72cd84414f38fdb429ea9a8 SHA-1: a00e58831d65e6047040f36572ea00a13f7a5aee SHA-256: 5e14bcc6d7b8252fba1b6cdf3b1b0aff4762b7f446744a8e40873270555c9488
184 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many pointing to compromised CMS upload directories or disposable hosting. The 'PDF_IMAGE_LURE' heuristic indicates it's likely an image-based phishing lure designed to trick users into clicking a link. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the execution of embedded scripts or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://euro-m.si/web/dokumenti/file/13118288140.pdf In PDF document text
    • http://www.s-prom.si/fileupload/file/38014798218.pdfIn PDF document text
    • http://liily.jp/upload/file/20210916093502.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/o63n564ppt5uijeepfvdqgk6v7/pigozirope.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/57656766187.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///76769970775.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613834ec5c14a---90117158022.pdfIn PDF document text
    • https://begili.com/uploads/image/files/97679690283.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16140f5b9af862---rugotukonex.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/senojivefazovidet.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021090902015160.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/15929643160.pdfIn PDF document text
    • http://faptvmedia.com/userfiles/file/tozupezogigerugikig.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/sobov.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/18sj63ka2kfailkrdo7cqj0lk2/bubaxowelelopupelapovobod.pdfIn PDF document text
    • http://entrackintl.com/uploads/11285035024.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/85557807388.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/ruxexijitubejujomomakite.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349714ae787---fegizo.pdfIn PDF document text
    • http://proleague.dk/userfiles/file/zufokosudemu.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/dodoxebapunojedubodafi.pdfIn PDF document text
    • http://elpijisystem.com/file/29140913015.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/54979651422.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/21696821426.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=credtly+com+boom+beachPDF 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_off0000b1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B1 10556 bytes
SHA-256: 5f7542fc3fcd42ee73e2f9f294aab0bcdd01d70ab9cafd00b9e9f78c4c532522
font_01_sfnt_off0000c9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e1e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E2 14164 bytes
SHA-256: 81cb7bca07c2da07cc158e4e6604c9e3ac7cc53d3d7188623d55eb4275655dfc

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