Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8baf0edefd1d715…

MALICIOUS

PDF

77.9 KB Created: 2021-09-17 17:46:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2ee47ab4e972a1be5044bb050c8ff5cd SHA-1: 2127852390a3d31d95ed5f666f59b95884d1f0ec SHA-256: e8baf0edefd1d7159a4b727276314e6827a4f5d29d13b87e2e62e200812eaf8a
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a link farm pointing to compromised WordPress sites, suggesting an attempt to trick users into downloading malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass security filters. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://laborke.ru/uplcv?utm_term=warcraft+3+android+emulator PDF link annotation
    • http://studiolegalebisantis.it/userfiles/files/motewewegubegu.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/latafovegewetomowi.pdfIn PDF document text
    • https://cet.sk/res/file/23390627615.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/snfcqph40eslgeh8246ru17q9m/lititozofapatotelexoler.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca6d9dede3---41009386478.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/3413106847.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/79145477245.pdfIn PDF document text
    • http://tuyothuyluc.vn/webroot/img/files/42763178488.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/denedekitaju.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/22606343105.pdfIn PDF document text
    • http://www.atsamuihaus.com/image/upload/File/dipixijaviruzibaduzebama.pdfIn PDF document text
    • http://word.mn/uploads/assets/74979576983.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///rolokirimomenuranejopuguj.pdfIn PDF document text
    • http://innersolutions-uk.com/file/49160394002.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/dezuvotomatefenadusogopam.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents/files/96722168361.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344ec29e970---fikujifejato.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/81039891388.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-13/20210913075216668853.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/budotujibewixen.pdfIn PDF document text
    • https://kham.vn/userfiles/file/vurodolavego.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/17469212137.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/lalutazijusew.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/29298917614.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/27915526125.pdfIn PDF document text
    • 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_off0000ca05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA05 18364 bytes
SHA-256: 571d6aeee771628fb59f8f0637b27cdc23da5609df9a0ed8b0292e014237114e
font_01_sfnt_off0000f9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E4 10732 bytes
SHA-256: f55315b5bf3a44f8afaed20e7e9360d7c2a128c5bdf683ca0dbd3a1afba1bceb

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