Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cdf8f0f3b93f063…

MALICIOUS

PDF

83.1 KB Created: 2021-09-10 05:52:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0fde52fe4a09126f27e58aa6ed7237f6 SHA-1: c88b379c89cff3055c64ef8c16e1818b60ddb97a SHA-256: 4cdf8f0f3b93f06364fb6493a3937a5a032c57bd63481070488305197b6b2f4b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery via these links. The embedded JavaScript may be used to further obfuscate the malicious activity or initiate downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=emulator+location+android PDF link annotation
    • http://www.siposferenc.hu/html/73516403997.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/c8c0f0c085598bb3abc781e7119914ba/85895900719.pdfIn PDF document text
    • http://eva.am/files/e2abc7db759612c9.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/27236807274.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/xunidakezitopa.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/83265209703.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136cbb496e42---dikagobejolenefadewul.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/wozivewaseguz.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/dukojodex.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/besemebi.pdfIn PDF document text
    • http://www.msjcongregation.org/www/js/ckfinder/userfiles/files/nepizaro.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/pewog.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/mikiretasi.pdfIn PDF document text
    • https://unosms.us/userfiles/file/81804388701.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/5ab6239e32029a886ec9bd2ab200ed0d/vifivaji.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/wimoxozizi.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/36568011489.pdfIn PDF document text
    • https://guruvinodji.com/Userfiles/file/fuxijepipanudesugexapev.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/f7b58813f9908024ad591acda6b2ae5f/85695921306.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/tifigilu.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/85306887865.pdfIn PDF document text
    • http://eco-building.cz/UserFiles/File/11618669569.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/10377936695.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/latejefo.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_off0000e2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CA 16996 bytes
SHA-256: 0ece0b26d14ebcc6c784c1f5bd576edc466383ddf8c09f85938cf4b84b5b04c5
font_01_sfnt_off00010f39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F39 10316 bytes
SHA-256: 34898458150bbb75812d06ff0d0a4a518c37d6cdb6aa5f0335746e88aa5e74ce
font_02_sfnt_off00012663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12663 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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