Malicious PDF — malware analysis report

Static analysis result for SHA-256 b118a5f99d8b9bc4…

MALICIOUS

PDF

82.5 KB Created: 2021-09-07 09:22:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c1aa44672d79269f0048fbc65dbe70cc SHA-1: afa7dbe617e86323471f22fe5f012bebe8c6283d SHA-256: b118a5f99d8b9bc42c6af35ddff604c53e5d40b144084d917183e70197a4cddf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. The PDF contains embedded JavaScript and a link farm pointing to multiple compromised WordPress sites, suggesting it's designed to lure users to malicious content or download further payloads. The presence of these elements strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/p8chs4nrq3o5uqb70e122i1256/53684418628.pdf In PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c8d0ebeda---videfalesebejugimox.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/negibujefowiritogik.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/mupesosurop.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/wugunuli.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/17609714323.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/06975cdfb1ed68943530e7e83234c5fa/sepomunupavedimizapebexob.pdfIn PDF document text
    • http://onlinevay.com/upload/files/kekurituxabomimeneru.pdfIn PDF document text
    • http://asustainable.com/global/file/podibiwitugakelalobo.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/7396813348.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cf5e6878a---vitiluzona.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9f8edb38e---57556335433.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa62003719---42806277132.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/netevuxewiwizejepadokexor.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/66169486520.pdfIn PDF document text
    • https://senhewood.com/d/files/jufedatudinulezakol.pdfIn PDF document text
    • http://vitajeans.com/ckfinder/userfiles/files/60930613564.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/65932266120.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c59281b8e80---nesot.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/2754447159.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/mulebemuwujet.pdfIn PDF document text
    • https://derey.nl/app/webroot/files/userfiles/files/konetuvafimitebanelape.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=unreal+engine+4+c%2B%2B+book+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_off0000df96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF96 17188 bytes
SHA-256: 8ea786a776fcdae3261e15ab4d4482b2fcf3f1eea0931c56bc49fbc8eba754cf
font_01_sfnt_off00010be2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F9 10848 bytes
SHA-256: d7c0f5972ec9e87359b644d278e99678f84edbb163fddd96d703b6e064f7096a

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