Malicious PDF — malware analysis report

Static analysis result for SHA-256 74b4992be0c51238…

MALICIOUS

PDF

78.9 KB Created: 2021-09-16 21:43:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 62e30294a3c0dda12534e4575cd6c7f8 SHA-1: da0c2e8e834dbb60ec7fd3ce0a9e789ba8fae451 SHA-256: 74b4992be0c512385a9fb2b80e537e9d2143d0aa0335a8ccc4c8b49f2d20e7fd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28965891417.pdf In PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/16707748631.pdfIn PDF document text
    • http://royalwedding.jp/images/blog/file/59457427523.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210907190702_1364361794.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202109060630281544.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/d93b7f5ffcf341fc516d62aaeeba4f54/26487814967.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/sugenep.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/161416f8cd451e---dotakugamuzesuja.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/757900072.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/45827738771.pdfIn PDF document text
    • http://www.startbatteries.gr/ckeditor/ckfinder/userfiles/files/ponejasuwexopa.pdfIn PDF document text
    • https://bellcera.60km.com/upload/files/dajijuputamumonipeno.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/kotubugebevavepufikelage.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/nepifagubizafifaja.pdfIn PDF document text
    • https://keongracun.org/contents/files/sumizijidubux.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/gofexorudujipofomigu.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/zomojogapurane.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140bf5a62119---ratawebonunixori.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/48984643654.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/39007279769.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/keseviresekoja.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/zomibuwujidemajubaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=download+vidmate+linkPDF 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_off0000d282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD282 17312 bytes
SHA-256: 3f1323de7b43aa00a00f8374848df1a54b0473cdc4ffcb3d6127aa75ea3c6bd7
font_01_sfnt_off0000ff35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001174c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1174C 10384 bytes
SHA-256: a4256b0b61ce2a6295e69134314e3e6c289860f9cb41cbf18a24f667dceb61df