Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f669e3ebd60ad0b…

MALICIOUS

PDF

130.7 KB Created: 2021-07-13 21:28:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 88e827f2ffb8b08edbed7f277fdf8394 SHA-1: 35eb3632f5254b647efaaabfec91d4edc501acdb SHA-256: 5f669e3ebd60ad0b999428f7c81ff973b8586dfb66d0899e4e824ab37afd06a4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec4dea53a3---41459159153.pdf In PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/74195493306.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/gebesewuwemupesuzefaluwo.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/54511715153.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607447e3eeef9---9620785171.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/butvenom82eqk2ce9kmav4d6v0/36843550394.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/66308852024.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608790d0921ab---76861783666.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/jugab.pdfIn PDF document text
    • https://tycoonmarine.com/userfiles/files/bakijovotes.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/ba465255204e9551956588ad7dc89a96/25026970517.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/migajejozoguka.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e69d1dab8ecfe301baa186c55fcb21a5/66794513730.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/v1uetov7so66b4f4s6onscj665/dumusajosoguduv.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9dd6d6633c---243075624.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075be6ab6a95---wawovagirukivudetaxerane.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/vubabavoninufewem.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdee11366d---noresepewetexugedi.pdfIn PDF document text
    • http://beverleyannes.net/home/beverley/public_html/ckfinder/userfiles/files/gagexapitemav.pdfIn PDF document text
    • https://invest.pl/userfiles/file/muwufutakadoxel.pdfIn PDF document text
    • https://bio86.net/fichiers/diwitifufux.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/fgposr36k166e1mq0aufb4olg2/46791619837.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/motada.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=statement+of+comprehensive+income+problems+and+solutionsPDF 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_off000198ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x198EA 18660 bytes
SHA-256: 92b3cf21e21ed1f8c19702df5bebcd941153c6dc79c826699afc6af7d58946d8
font_01_sfnt_off0001ca88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CA88 11264 bytes
SHA-256: d955b042d9da8dcf1ab42d3db90889f3ae63a611493d62d0da8bd4ff1286e4bb
font_02_sfnt_off0001e486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E486 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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