Malicious PDF — malware analysis report

Static analysis result for SHA-256 22d5726b248cc9e0…

MALICIOUS

PDF

74.1 KB Created: 2021-07-01 15:52:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5be6c5ef27f18781f4cf2de63f885d84 SHA-1: cd2c9de97b069a1ae201fd1a266092ca0c64efa3 SHA-256: 22d5726b248cc9e09a3efe905afd917610069c2dc03460bd91337e59d2d15aa8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm with numerous URLs pointing to compromised WordPress sites, indicating a likely phishing or redirection campaign. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/c1139bdac1ab0d06b9b2679509ae08e0/foxavigo.pdf In PDF document text
    • http://ncabhsa.com/clients/875427/File/mefudikasaj.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/bujojekakubatip.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/k26e3fq68cbknj4jgrvr2pmh92/5624789796.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/55749122218.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ca62c20986c---ritivonatadulexaw.pdfIn PDF document text
    • http://hill-macktribe.com/clients/7/78/785e88641dcef8d5cadf71fa969cae92/File/1283620521.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/g7mor8clk5uj15ftokjkav12mu/31906156013.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/36212112494.pdfIn PDF document text
    • http://standrewsparishhighschoolclassof1964.com/clients/70428/File/21964263775.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/xopetojiludaranewetesazo.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/wuxuriti.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/kesopekadimemig.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16093add8555e1---53888080723.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609eca13cbb15---41631868536.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/ccf5556d5ca5f8a8bbda4d973877d531/kuvexonasuji.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/a0885b70d2b7325ae4cdaf7fad618750/76532417383.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a25b8dae6---vakimozon.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/84320469573.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9e35639c3---gixetezomiv.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086eb08485ca---75087046542.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff12fda6ed---joluvifupuvavove.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/fac646e3fb6e56a1672f6fda895f3c43/pujafelejine.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/f4ejjtjb5cfquh3k66b9ldtpm1/58573947526.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3b60d455da---78306445075.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=thug+life+meaning+in+social+mediaPDF 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_off0000bfdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFDD 10788 bytes
SHA-256: 07ee2c5d1c5995c0c07cf4175c4a10d8ccce7e908c2dfa24f5911ee2f6d1560b
font_01_sfnt_off0000d846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD846 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF058 15976 bytes
SHA-256: e1e1962afa4d7d5a893fe71e72c4dd631ea0822256ad6a1932c62afd72bd8dab

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