Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa0fdac533614e6d…

MALICIOUS

PDF

79.3 KB Created: 2021-09-03 23:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b48acbac576fbe552a3ac0dba69646a2 SHA-1: aba3cd15353d5f5d101fea9aa85b6fd2b0c74426 SHA-256: aa0fdac533614e6d84ba6b70cb3254878413cc0b7673b2b679bd19bb76803178
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript and link farm suggest the document is designed to redirect users to malicious sites or download further payloads, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://toolsatool.com/userfiles/files/24260594216.pdf In PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/nia5qpgn0v3h9cv3esmojuq827/janigaveradosal.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/aj9opl3thr6cgk69k0ttvbb86k/18179857655.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/39629368412.pdfIn PDF document text
    • https://edusfera.pl/upload/file/bogofa.pdfIn PDF document text
    • http://berrybucs1973.com/clients/3/3a/3a2d6910be1067feaf6dc79f90d505e0/File/33550136020.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a636755780b---80070961681.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/92945597645.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/a82b0041d3c773b1b6c864d43f1f77a6/57417902579.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098d21f9d244---78622292332.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210901_211550.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/20640755262.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16083040bb1799---meveteralidejodadem.pdfIn PDF document text
    • http://taiyoaquris.cn/upload/userfiles/files/20210602055451.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098cf80bd323---lemotu.pdfIn PDF document text
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/88422529400.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/bilov.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ee90e0a98---7338478473.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/41868178706.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210828070736384657917hcb.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c634e31334---wufiragokozumavopamiluxud.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/luzev.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/b9ff279477fb02daf22c222d6a83f3df/60137963370.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/86678358920.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=example+of+appeal+letter+for+school+admission+pdfPDF 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_off0000d1ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EE 17268 bytes
SHA-256: 0999dedce71a4264238bece966448b236f70fb6fad424de44a5f22dcd25fa777
font_01_sfnt_off0000fe57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE57 10968 bytes
SHA-256: 8ff416b21078921d04eeb32843ce71e3c1344e6ee7f7af4d3de34ad3b309ed50
font_02_sfnt_off00011798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11798 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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