Malicious PDF — malware analysis report

Static analysis result for SHA-256 df7e99678afdcb97…

MALICIOUS

PDF

73.9 KB Created: 2021-08-28 14:12:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 97ef7284716db54ebaf7bb655af32e76 SHA-1: 3a29ac1533fe3b7ce92a96af616dc4cf5a342715 SHA-256: df7e99678afdcb972c9ea215a003a82c0f9553a80daf3d95c29c8ce421641258
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file exhibits characteristics of a malicious PDF, including malformed streams and a high ML classifier score. It contains numerous links pointing to external PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URIs indicate an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9825

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • 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://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/17216310653a79fe13fbd0104433f7de/29986060089.pdf In PDF document text
    • http://ks4073.com/file_media/file_image/file/womogarobadenokiga.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/loxezeg.pdfIn PDF document text
    • http://bethelhanberryaaa.com/clients/2/24/2465ef4bb9bb1b7382310ae17d7cafeb/File/gejorisetovo.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/fozeluzisonupaw.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db611790ff0---52078971753.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d57bd142f---gapiwokegenaja.pdfIn PDF document text
    • https://tanthuantelecom.com/upload/fck/file/putibe.pdfIn PDF document text
    • http://epicridesnepal.com/files/34656615016.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1608d018148715---2617711083.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d58fb8392---29994672202.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210716_C51F7025CE9A0CAF.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/xoluxobavozujunajepofek.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/hqpk9ouj4proeem77ud7pgfqmc/bazimunefinafimibuxivod.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b11bfd4065c---12018446530.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/walawan.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/dipapame.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/50b157690b7aef94a9d6c0b94087f126/31616462801.pdfIn PDF document text
    • http://gibisch.biz/files/files/21901045969.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/gavuvulesonekep.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/pedexifazepupuxu.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/25049432157.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/8aqq4jfh4460325nho321phl34/62517272203.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d3aa9cb2460---65202243614.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/l9sqkrtbghvrmjngc2ha3v17kv/23246748584.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/60861150929.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/bisoboputen.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e952ab797d---21676968024.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=gizmos+cell+structure+answersPDF 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_off0000b9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9BE 10676 bytes
SHA-256: cef4bab0c30909c33a0cc1249a2f6523d5fe0fa14199b26c141954841f8a707b
font_01_sfnt_off0000d25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6C 18892 bytes
SHA-256: 9021036c101372db8b656278b96d099a77b33353b91a965a050e6051b82ab509