Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f3e26a0c3c37b38…

MALICIOUS

PDF

71.1 KB Created: 2021-09-17 06:35:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f9ef2f3f6a38979bd73a4f914cecb832 SHA-1: e4bfc927eb3440049b7904fff3903bd192b3758c SHA-256: 1f3e26a0c3c37b3853a1321f8889077fbb3d440afb01e30f98a2d9e964f535ec
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the download and execution of a second-stage payload from one of the provided URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://philabc.ru/uplcv?utm_term=super+slime+simulator+mod+apk PDF link annotation
    • http://skontrolsengineering.com/file_media/file_image/file/sukogu.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/2403493682.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/fuzezovagifav.pdfIn PDF document text
    • https://textosolutionslinguistiques.com/upload/editor/file/83384514748.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/65728252569.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae3e124452---bigatodujigetes.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/52607218435.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/64000846697.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ef81a1e50---41544900572.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/41393743234.pdfIn PDF document text
    • http://xaydunghoangthanh.com/img_duhoc/files/jexapexez.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/dovubut.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/vukutidiwexiwazajewixonu.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/gujevugufemizu.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/xuxodepufazodizotozulo.pdfIn PDF document text
    • http://njxinbell.com/upload/files/35125910668.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/xesakopoxujodame.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/87306709182.pdfIn PDF document text
    • http://tipiland.net/upload/file/19558070809.pdfIn PDF document text
    • http://www.s-prom.si/fileupload/file/47232598715.pdfIn PDF document text
    • https://memorybg.net/app/templates/js/ckfinder/userfiles/files/86668336559.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/c24acabaa892644bf435fc989e53b9d2/litivexik.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/35763313734.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/52950935114.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/fadolasuxolizofibu.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_off0000b6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEBB 10716 bytes
SHA-256: 29c69e0fa9ed362edab2e3eaa081b27c1ef9cfc16b00c29b882e9a586e4155e1
font_02_sfnt_off0000e754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE754 15852 bytes
SHA-256: 4bd7f94b348abeb98b7b16cb2a6a32802fb2fb62b5670e940e82cb73674902f7

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