Malicious PDF — malware analysis report

Static analysis result for SHA-256 66767877b6bce0a3…

MALICIOUS

PDF

83.7 KB Created: 2021-07-07 23:54:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ab947ab5dc59b9804c772ae81b5b06c6 SHA-1: b390f5c3286b722ff45d6e53e919fa31d4e8a9e3 SHA-256: 66767877b6bce0a3d2329408c26c369dc3258daf9bd99c6f1b04ebd62795011c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many of which point to PDF files hosted on compromised WordPress sites. This suggests the document is designed as a lure, likely to direct users to malicious content or further stages of an attack. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609da83a72640---jozisomovinevazaworosumow.pdf In PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-6-1/20210601091027823775.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab1d386c52---30920376109.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/70bc21406835924c3f7712aeb79de1e8/68351481141.pdfIn PDF document text
    • http://togetherwewalkny.org/clients/2/24/2411cc079aa0f0d7fd57f81c6163ecfd/File/95090526271.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/41948126003.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/5vbr5tajfpgi2b0b7figam4180/verufor.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/90932384933.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609bed61cb390---85379101045.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/zawilugivuv.pdfIn PDF document text
    • https://penal-garazh.ru/files/84995109198.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/43257752635.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/v1iloidu08utc9ohflhhmle8k1/6532357646.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/becd09c19afa4a3828460f841e2d24fc/47814062065.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/15609318612.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/81635236562.pdfIn PDF document text
    • http://altinay-law.com/images/file/sovodad.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/5r68flefjlshd0i4si9daa8hfq/65497278515.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/gizipik.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/ac1cfff1c3c9dabb938204c26e449ffc/fetobixifax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=endangered+dolphin+speciesPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE779 16500 bytes
SHA-256: 363295932aa71216b3e4276d8e175f5efaaacb3f45cf3a6cb508cbfbba67bd62
font_01_sfnt_off000111e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E8 10680 bytes
SHA-256: eb4ed04bc22a860d3c95f28fd4b6a644ec06e539f4f429cddf82be8688f1ecc2
font_02_sfnt_off00012a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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