Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9550722d650e66b…

MALICIOUS

PDF

87.6 KB Created: 2021-09-24 09:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 350fb042021b577c7bcc5fc35f3eb71e SHA-1: b42dea19d0c16426012455c504ec8c5cee90614e SHA-256: a9550722d650e66bf7ed22118149159eba305935f743c0c285c108e7492cd930
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to disposable hosting or compromised CMS uploads, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://salespate.com/userfiles/file/75150863153.pdf In PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/fawifop.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/61603122651.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/cac4e0cd3eb18a68eb6c2a3668ef1252/71963039525.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/23060122262.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/suloxafovagak.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/48026332603.pdfIn PDF document text
    • https://macjiboter.macjahisa.si/files/file/51106708221.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/wajakapokuniludigon.pdfIn PDF document text
    • http://abnicum.ru/files/file/nugit.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/78004805107.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/ghb8sg84mpmd9090sgcmjel1hp/zuzuzu.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/83600909974.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/91302056734.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/75635385830.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/15175187034.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/93652186927.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/siwemulagedofevo.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/kaxebilixosun.pdfIn PDF document text
    • http://galettedesrois.eu/userfiles/file/zujadiba.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/poxolewava.pdfIn PDF document text
    • http://studiodara.eu/userfiles/files/37579435811.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16149f541ebf95---63432941334.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=best+font+style+keyboard+for+androidPDF 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_off0000ecce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCE 10744 bytes
SHA-256: fbca72814f7a0c16953aae12e06bda5d22aaef3da3051cff9170c13e8d168a19
font_01_sfnt_off000105af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AF 19460 bytes
SHA-256: b045360e4f440c1ebd8b82443e3cf937e6da83599ba9cb09c156977a4e71a5ad
font_02_sfnt_off00013831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13831 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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