Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f3f6980544a0922…

MALICIOUS

PDF

77.9 KB Created: 2021-09-06 19:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3d2df64cf55744e48578bbf9a4c956f0 SHA-1: 9b7230f67a39d24a17de96714174017166bea0e7 SHA-256: 3f3f6980544a09222fdfb93c23e789c44d4b93bcd38fd81365ed2df620fc665e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/195t5ucg36ib4c7vt38u74eua5/mozulatekenuwog.pdf In PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e910074324---65625353558.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/roganofokeb.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/woxitunaxidofevezaluro.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/88089642612.pdfIn PDF document text
    • http://chipgene.com/image/files/20210702_002530.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/maximewusejexukoj.pdfIn PDF document text
    • http://thongthien.vn/upload/files/fubewuvokawobakotoxezejid.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tabewufekolenosovefu.pdfIn PDF document text
    • http://thietbixanh.net/uploads/files/pufov.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/fk2sekpv791chjtsva9c13pd2f/doviputuvonuwe.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee562a89dc---95408767779.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/ccad5578025154a5826c4aa724de7fb7/12648561372.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/11471999579.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/16512535172.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/66126886585.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/jotomalixeteripinim.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/penogopilapalezitore.pdfIn PDF document text
    • http://www.louisianarebarcontractor.com/editorimg/file/39675811319.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/94896167363.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759afac7757---30525196927.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=allworx+phone+9212+manualPDF 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_off0000c9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F1 10768 bytes
SHA-256: a5eb221b90c5d70d8b12c7178c38ec40295ca4e55b25ac42877a92163f038e52
font_01_sfnt_off0000e2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B4 17624 bytes
SHA-256: 9b9e190356f4b3b11933f04811418877306e896c67992ff8d64733112312fd23
font_02_sfnt_off0001107f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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