Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8e78998e5b856e9…

MALICIOUS

PDF

84.6 KB Created: 2021-09-07 22:17:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b2c88c70abf55e19ccf68dd90a5a8e3c SHA-1: 56d0bdb03a04b05395d2457d939f4448de65ceb2 SHA-256: f8e78998e5b856e9c5864ddbe9a55d94c63f524800918f0b8d02401e91d179ca
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains a link farm pointing to numerous domains, many of which appear to be compromised WordPress sites used for hosting PDF files. The primary purpose seems to be redirecting users through these links, likely to a phishing page or to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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.
  • 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://photo-preiss.com/upload_files/files/rezeb.pdf In PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/c209e15f595a36984e97aece1b5f94c8/54480336475.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1fc042e3f---lazadevodavolibosutuni.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/77071013939.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16110caba4e62a---fexizumudovipefokigepe.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/04if1o0id820d9u90dlvdtkie4/wuwagubisitu.pdfIn PDF document text
    • http://e-sportis.com/images/upload/fakep.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/63036123740.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/93397874980.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5c375ef0b---rupadowesimikato.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210730_7B079B03FA2FC16C.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/41189285857.pdfIn PDF document text
    • http://townsendrogersfamilyreunion.com/clients/9/91/912616e09393d205379ff76530a10a1f/File/1202563185.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/xabevikumutulamiruvut.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/ropalevubulo.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/tiseguviz.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd96302361---gukizubeliwi.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/mawizovapuneni.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/33362759273.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160985a94667df---19957332563.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/6968d013bb17eb0072083033492e07a3/33380411089.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/l60jq40kvssio4o6dhnns51ct5/pozifu.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160acc084e0ec1---pizunenanetedivapasedoxu.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vakelilejiz.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/8226e4ac1d06bcd2c00b4bef89f27f3f/zenubir.pdfIn PDF document text
    • http://www.irrv.org/uploads/files/kipivalozusivoxojetapab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=mastite+granulomatosa+tratamento+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_off0000e157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE157 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96E 10936 bytes
SHA-256: 08657e956534ef326887bca0a118215b126dadc3c5a739b75cb0644c69f006a6
font_02_sfnt_off00011289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11289 18676 bytes
SHA-256: 8def6ea5cd157ce0ee0ba1f0e436211281c62c319c7c65614bc3e5c5b5176ee6

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