Malicious PDF — malware analysis report

Static analysis result for SHA-256 360c34531ba59f40…

MALICIOUS

PDF

77.1 KB Created: 2021-09-19 14:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d07f38f044cd1f2f85d7515321d1dcb0 SHA-1: 0584c68e9b7b73a4a799d018e3890cedb27211b8 SHA-256: 360c34531ba59f40f97ef1f645e76b64b6180e6d1c1c302f8c16411ef10a2284
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The file also functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://usefchina.com/uploadfile/file///2021091103314280.pdf In PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/numimo.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f698609e35---44121508768.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161469a3b8d72f.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/6948680642.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/lavimavavimegamef.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/kusufe.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/35f01525d1b32cb59059c97c14a23741/88345681021.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/mesibi.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/zegamesitutovi.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/jazavenolibipavi.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/mosodi.pdfIn PDF document text
    • https://viceda.com/userfiles/file/40856437874.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/tulixoxid.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/87714210222.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/gizelijudavoxaw.pdfIn PDF document text
    • http://affectif.ro/data/Image/file/juwafuvijilun.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210919033141.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/47704265399.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/jegamiwiwel.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/96936054795.pdfIn PDF document text
    • https://ewt.cz/res/file/wopuwujizanarodogo.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/rasodovovujojaliveduxirik.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/71393213709.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+use+phone+as+remote+for+chromecastPDF 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_off0000c95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC95B 17128 bytes
SHA-256: 243513de379707a927986ed414590655743c042cc5f8c67c904dd92fc2cd621b
font_01_sfnt_off0000f5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F7 10784 bytes
SHA-256: a842fec0cabe007d964102e0d191ccce7b0cddf9b4e463776083a0982ff4c174
font_02_sfnt_off00010eb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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