Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cd8c00846b33420…

MALICIOUS

PDF

83.4 KB Created: 2021-09-21 00:10:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a75baef1ea284c0cbd07e1919f411d8e SHA-1: 9c470e0b5ab4e09f34833df2b2d2c90dd55b89aa SHA-256: 6cd8c00846b33420e26cab523dcc388c750667d95fd1265cac25e72e7eaa896d
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of embedded URLs and the overall structure point towards an attempt to exploit user trust by masquerading as a utility.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://crysiq.ru/uplcv?utm_term=convert+email+message+to+pdf PDF link annotation
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/1058302149.pdfIn PDF document text
    • http://xn--c1adbeke4asdefy.xn--p1ai/ckfinder/userfiles/files/juvonilete.pdfIn PDF document text
    • https://vnjhanoi.com/upload/files/fasugi.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/31479380593.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/jamojogawamosevalu.pdfIn PDF document text
    • http://mirsistem.com/depo/sayfaresim/file/47132160174.pdfIn PDF document text
    • http://thepnguyentran.vn/media/ftp/file/rememi.pdfIn PDF document text
    • https://pastijptoto.com/contents/files/juguweraxatofevadunejur.pdfIn PDF document text
    • https://dm288.rs/slicice/file/lujokoj.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/81l9qc36g26q0hna1mmkrmsad2/jigukakuzebujuwi.pdfIn PDF document text
    • http://eichler-kammerer.de/81753952425.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16143ce39e6154---90262565293.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/gexokedozirep.pdfIn PDF document text
    • https://jotelek.hu/files/file/67694475994.pdfIn PDF document text
    • https://emmaushuis.org/pages/60771028151.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/9b50be6c52533a8bcc238545736fb662/vagusemijajuz.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/kalajetobafeseboxatira.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/57005939695.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/74837765186.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/buteboned.pdfIn PDF document text
    • http://hingliltd.com/userfiles/33141053385.pdfIn PDF document text
    • https://ekinyalitim.com/depo/sayfaresim/file/69507135634.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/xunepasukomapanuxoj.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/56377173053.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/6397860114.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/0jvvpb5dpq8sbr5ecm7t71l1a3/xovatidipo.pdfIn PDF document text
    • 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_off0000df75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF787 18180 bytes
SHA-256: e6efea36ed07bfae4274b2293c2d383177bc9ba833eaa157beccec599a6419dc
font_02_sfnt_off000126bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126BD 10940 bytes
SHA-256: 48e2ba47a9190b22f6c8a2017430cc150e9d30d1ba8989e89f81985acb932019

Open this report in the interactive analyzer, or submit your own file for analysis.