Malicious PDF — malware analysis report

Static analysis result for SHA-256 9acd81fe4c624f32…

MALICIOUS

PDF

86.9 KB Created: 2021-09-20 18:27:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1f91f173c0b75f072d3207582f616ee6 SHA-1: 252e643fd47d28434923222ac3119b2f70e636ca SHA-256: 9acd81fe4c624f32230a27a146da6f64a51c33fbd98604bc898a9bebaf8513eb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including links to compromised WordPress upload storage and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites, which are characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://soloparamideco.com/js/new/fckeditor/userfiles/file/panosulefidodel.pdf In PDF document text
    • http://ilyxrace.com/userfiles/files/94378137621.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021090504042979.pdfIn PDF document text
    • http://jawarakreasi.com/file/90623692141.pdfIn PDF document text
    • http://domuran.pl/files/file/fatotawofuzupasu.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369f97a1a44---jukawonodesodazenozuzafi.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/mupizubuwerawumozozo.pdfIn PDF document text
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/24932862267.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/9099988859.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/30645001544.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/53029903661.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/8400ce97d180ad143ccb2830301f91cd/1005573605.pdfIn PDF document text
    • http://111-orte.com/testarea/cwsCMSlight/media/files/98690200711.pdfIn PDF document text
    • http://japanbizkorea.com/userData/ebizro_board/file/92142000574.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/81687266707.pdfIn PDF document text
    • https://majubesar.info/contents/files/18831341060.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/bulemesewogomaz.pdfIn PDF document text
    • https://clicksnepal.grnca.org/img/files/files/rodubodirotazak.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/silukupijakagiwumabowuk.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/miseratijosaliz.pdfIn PDF document text
    • http://khachsansapa.vn/webroot/img/files/48587922206.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/nipuxesex.pdfIn PDF document text
    • http://nanoservice.cz/upload/file/pujerimoxadufiximipu.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613131f488840---1221155879.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/derumumuto.pdfIn PDF document text
    • http://detskypohar.cz/upload/file/76221885237.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=all+star+tower+defense+codes+robloxPDF 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_off0000eaba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABA 19672 bytes
SHA-256: ca98caebf3e6a1e284181b71afcbf0e237e16d726aec183b1634ddd6f2bf4ee6
font_01_sfnt_off00011d46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D46 10684 bytes
SHA-256: f1e4e178e06a2e547d3dce8a00a731880c487c4bc2ecc2fa62e507d3a9e9a7e3
font_02_sfnt_off0001360e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1360E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1