Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9e356418271fed8…

MALICIOUS

PDF

83.7 KB Created: 2021-09-05 04:25:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a187f7a81328c10c9e424924c9fcd5af SHA-1: a6bacf2226c85d386255906ae068e7f9fc45f8e8 SHA-256: e9e356418271fed8e8a5300b39e264b4417398140b7dd53ddc16614ef8f2c0ab
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a large number of external links. Several heuristics indicate that these links form a link farm hosted on compromised WordPress sites, likely intended to redirect users to malicious content. The embedded JavaScript, though not fully analyzed due to obfuscation, is a common vector for further exploitation in such documents. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • 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://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/2c549f23779914c39f7e979e040e99c3/tetuxelimobetokabobof.pdf In PDF document text
    • http://okwmd.com/upload/fckeditor/file/25595455051.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607454ca89481---lomole.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/783036bed66f9d0891bfccfd810bfed4/20365195955.pdfIn PDF document text
    • http://emeraldoutback.com/clients/f/f6/f61299a274fa8fdb0c00f5b1ed511d42/File/lusati.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/96722094566.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/cd5708fbf8f99e36e529d6baf3134ada.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/somiwanimuzeduvufetil.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/gukarabolobexuwuvujagu.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd81100584---kowon.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/o1efbliplrf5916dm3uv42mcr6/64457666862.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160871e6071839---sipid.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/faxopikedavil.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/b36ad63897e3e0baabc597c51d21e73b/kunesezugerapen.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2e65441ff---26662099066.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/5cb04300422c56c2ec8ce9da963eadeb/63114854428.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/555cf3bc2be6b09c4bd975efc80aa52b/20897369489.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/malufufefesafusoke.pdfIn PDF document text
    • http://tcurryproperties.com/konadnew/userfiles/file/37602218539.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/99739927003.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/fbffd8c631aa9c394aa34f4528dd64ea/40056526981.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115be8907b0e---64897736120.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/95629048905.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161170814f11ed---39044926504.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/niludike.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105b750b49ed---tanujomos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=flouter+sur+un+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_off0000e14e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14E 19336 bytes
SHA-256: 33c82850cfa59fd842c60fe6494873c66239452c863c7a29faee34896274ce10
font_01_sfnt_off000111a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C0 10316 bytes
SHA-256: 724a72410c25c6cb003a72e8a841f9ba7394038594138a6dc0bdb8e64a3f0f6b

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