Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b93640657268c93…

MALICIOUS

PDF

94.4 KB Created: 2021-07-19 12:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 17098380720477ad7f5ad89875d5ccaa SHA-1: df634a7399e167b4c979c1d533e3d095642e8c6b SHA-256: 4b93640657268c93e5241a4d73660f322cf1b0c0db9a60e6445d98e2806ae2dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external URIs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV both flagged this PDF as malicious, indicating a high likelihood of phishing or malware distribution. The embedded URLs suggest the primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://dynamic1984.com/user_file/file/bevumojumi.pdf In PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/n3c6hibei8rvbbpoph2eps6g86/66300643283.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160d42f871a586---30935800817.pdfIn PDF document text
    • https://equinox-e.com/upload/files/tiselesuwomutodegidolol.pdfIn PDF document text
    • http://abnicum.ru/files/file/kositukegim.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/bkbjcc6em7dam4s2854h2a5bl6/91490726108.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/aef2785dc498251e8e7bcf062d610fa6/16703274411.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a8697e08baa---zigasumefatijavex.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757440947a8---72648761506.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/legekakutebeseniwafob.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/nimetukaxopa.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a053b749fc7---58978977576.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/eb2dc087006bc76a463b13e22ba72dfe/17683439867.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/zofugameparegizug.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16079acf7adf3a---rediwutopekaga.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/jokadev.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/811446822cda93385e466fc6bf682e56/49104035395.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/bfe8a8492dd0a2631df10d964e6acd67/redosiratotapeso.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/fa938149e15816803b315183ff30c675/teruwutu.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/zeminugutapofovelesu.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/8f8f4fbc85105059198e5936226aae2d/wojobizarenesetagegewew.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/tokujr6a56o0hopjng9e5kvbig/durizara.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=ross+on+drew+barrymore+showPDF 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_off00010d3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3F 10660 bytes
SHA-256: a97fdbcd46c9abaf6beb67b3d978b6068ed6cba85f68ee01a69526844deb30fb
font_01_sfnt_off0001258d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1258D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D9F 17976 bytes
SHA-256: b93e2ffed567e852699143d99182de8a7b7daa3c229c66130a623ea1ad388155

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