Malicious PDF — malware analysis report

Static analysis result for SHA-256 17ec41b63006bacf…

MALICIOUS

PDF

74.3 KB Created: 2021-09-08 02:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7b6a76a38624edf5834d5ee8aba416f3 SHA-1: 5ae8e24a737bc13f5dd4d5bb70867363a27eae39 SHA-256: 17ec41b63006bacf9e7471a18dddfe6853fe8d1d162cb485e27d1513470e1862
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The file contains numerous links to external websites, many of which are hosted on compromised CMS platforms, suggesting a phishing or malware distribution scheme. The presence of a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • 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.
  • 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://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/205225f237fa1623e5090377410bddab/videparuzog.pdf In PDF document text
    • http://high-keenltd.com/userfiles/file/53778933737.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/1570948130.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c134ce6a52f---33050737249.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/17138502451.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/07/16/file/20210716_022927_116.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131c6dcc5476---lawuwepigananikawenovipex.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b484c4146---34639895464.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1c8c8aaa9---vukad.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/jfbil9k0k8qnue4nhmhirudv1f/91874645890.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/lodimovaxidenig.pdfIn PDF document text
    • http://drironcat.com/images/file/82549454580.pdfIn PDF document text
    • http://sartor.ru/upload/files/fifejumu.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608971ed8b1de---lafalenoleroxixopidij.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e0d6eebe5---dasaxevav.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/5194cc054f5373b5f8610f028371dbbd/25151012115.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/68807361891.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/95030903518.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/1463c056394435e0dcb784c6f301f8dc/91051604002.pdfIn PDF document text
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/makugoserimekeguvawava.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/7656480937428762d782bf83feaeaf47/dibupav.pdfIn PDF document text
    • http://zlhk.ru/upload_picture/file/nagova.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/sopabemoxagolas.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/0884d5ea2c60cd8cbb859be2d42b3d5a/tadovaxivuzub.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/kugemawolurerapupevuze.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/ad50e825099394c305d0e8b4636dbd4f/lasuxuwakugevutobikigu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=bnf+77+pdf+downloadPDF 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_off0000c244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC244 10092 bytes
SHA-256: 9be9b5f5704022c22be65e17f4add4bc3d8ab883b62efc844e00e0cbc8f7f85d
font_01_sfnt_off0000d8f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF109 16652 bytes
SHA-256: 189b5915c4483d5fad6a37e526c3385bba02b045d656be0dd15da522e4db2807