Malicious PDF — malware analysis report

Static analysis result for SHA-256 9105d9e44a62f2b4…

MALICIOUS

PDF

101.0 KB Created: 2021-08-18 00:12:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 94c04be89b9ac768e54ac74b106ae15d SHA-1: 8396571158898ec8615a1361ea84ab94e8c4bc2d SHA-256: 9105d9e44a62f2b4aaea12845ebc1641c374f0f57c8575c332a78ea3b78987d3
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery through a link farm. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://banghetretunhien.com/media/ftp/file/50620533117.pdf In PDF document text
    • http://anandtouristcorporation.com/uploads/sejuduzaxosanu.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/fopavi.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/gokegise.pdfIn PDF document text
    • http://fundraisingwebsites.com/clients/9/96/963d931f30a9d2280975e71a7f923c96/File/60021631192.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f20577eebe---81692614293.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/vepamivugegoj.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/896ae8db2aeb684ee6a95629afcb3bab/jonunofepivegokadowu.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607142cb269a1---kamebogi.pdfIn PDF document text
    • http://iteequipment.com/clients/65150/File/2606075368.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210714010152823.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d2f71664145---vekonafepisanuvo.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160e92c80bc8c1---tugizaranafavuzopanerodu.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e85220dbf5---39501972648.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd0bbe83ca---93852855767.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608593b4d7291---kutusevezumoxatego.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160de293b6f417---89616259227.pdfIn PDF document text
    • https://edmaker.site/wp-content/plugins/super-forms/uploads/php/files/66fc05945ba933640d3a8dba99cf9cbf/94370861545.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5e8da372b---82973249179.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/wutidipexotanowafogej.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/12500618428.pdfIn PDF document text
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/wafekedudin.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/wuzemugerofeger.pdfIn PDF document text
    • http://alkanboya.com/files/file///60336761755.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=what+does+the+moca+score+meanPDF 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_off0001268a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268A 10492 bytes
SHA-256: 8f99fc19a07ec10977e1f082cfd3db8cdc7f9a174858184212630e253e4da366
font_01_sfnt_off00013e37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E37 17596 bytes
SHA-256: b7dbdaf2923c7328c7bd0d861a3b0d359241f244d1f698a00d1472e528ce54f8
font_02_sfnt_off00016c3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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