Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3063616531a2ff1…

MALICIOUS

PDF

85.4 KB Created: 2021-08-08 20:25:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: baece54bf2127328de3f32fdf9b25596 SHA-1: 80e30ad9d31837415e8e52a36ac7045ad0e4a9ed SHA-256: e3063616531a2ff1450b1f9ecf63f5de5cf50416107992b208a3ef6bf472eb6c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to malicious sites via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cupta.org/userfiles/files/20210705010747.pdf In PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/niloligexenebubegeroga.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fc35d6ae631---30935737301.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/jtji4cce7798ht253jg1urkurr/pibalut.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983ddf903b2---tixelamosovirefepelof.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dee620a52d---50472600247.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/tenixemudovixofujujip.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/q7vrj6lrjqealdem6klv2qrqme/nulep.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/puserajonerawu.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/13828025904.pdfIn PDF document text
    • https://soechi.net/userfiles/file/vajoxobadovokixixumijire.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/xetujaboja.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/1996444247.pdfIn PDF document text
    • https://parc-hotel.info/file/81971300595.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160818ece78632---4190383907.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcfc300fef---40520734458.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/sidabumaxetofuz.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608f74444662e---75993692713.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/wotizezejutufu.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/6e7cfa970b17c26d5b2a93006138ef46/54040614716.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608058b1f140b---litawugusov.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/27013780750.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/473fbdff51d9d1f0cc4f9fc36b73c6ad/62051268983.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=sleigh+ride+easy+piano+sheet+music+freePDF 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_off0000e936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE936 11356 bytes
SHA-256: 02b141250faa2dc2f1e6bf779792acb5bb36b86804e674436a36b3f58f4ed847
font_01_sfnt_off00010385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10385 16904 bytes
SHA-256: 24649936bbf2a5cc29b329aa4c72ca0b113a9a8d67d05b7e4784d570df0914fb
font_02_sfnt_off00012fcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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