Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf98438aeb05f641…

MALICIOUS

PDF

75.3 KB Created: 2021-09-16 01:32:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0630d4b390dbd7a5ad8eb40a1eadbbcb SHA-1: bbfb54b335460b5f7accdd0b6e8a3e9c5fa3972a SHA-256: cf98438aeb05f64178692307351e9c33824d84f93793ab5dc2cd47f6cc166aa7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a significant number of external URIs, many of which are hosted on compromised or disposable domains. The heuristics indicate a link farm designed to redirect users, and ClamAV detection confirms its malicious nature, specifically flagging it as a phishing trojan. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=jogress+pes+2019+ppsspp+download PDF link annotation
    • https://gangnampools.com/contents/files/biwoniwasenuwezunifez.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/38092146757.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/zularufupumivajegugokifap.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/9266566644.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/zamubumiwavusaxatopem.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/nemawurowozo.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff1de14beb---kufuluf.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/nazeti.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/161426ae81b4a6---14682212865.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/vaziwawot.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/baxelagemuzobimasejirare.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/l02c9hcorv7taei60pj54r4gn2/17973931798.pdfIn PDF document text
    • http://kleinschaden-expert.com/userfiles/file/26168327640.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/mumofe.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/17908615392.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/zujimujiludutorogobixasew.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/sodavagikukenazuwupapug.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16140e2326a89f---xepotedotutobomen.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613561fc5261b---8602057597.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/sizusefukagemul.pdfIn PDF document text
    • http://timocomputer.cz/files/file/komuka.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/fovujifakunamotodo.pdfIn PDF document text
    • https://normec-cm.com/ckfinder/userfiles/files/serewupuwijasudom.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_off0000c2c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C7 16788 bytes
SHA-256: f9fc8b34ba3dbf3384eb8b250e4f782a570941747946dfdfa63cedbc48d12e85
font_01_sfnt_off0000ee44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE44 10916 bytes
SHA-256: cb2521bc271a9713834adb15c07c78a50403eca62154af7068a5f3d628be07f5
font_02_sfnt_off000107a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.