Malicious PDF — malware analysis report

Static analysis result for SHA-256 494a060bc5e363e7…

MALICIOUS

PDF

85.6 KB Created: 2021-09-17 20:22:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b3571a424ebc1ba8c2846c1c64b1df8b SHA-1: 684e8794edbbf29279916c16caa88a9b37d0299f SHA-256: 494a060bc5e363e7e12458bb0d4d21fb429fba27852318eafb00b3123152ccd7
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

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://irlanc.ru/uplcv?utm_term=spanish+adjectives+that+start+with+p PDF link annotation
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3ed647d79---logeziwaxisejokufe.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/83401749090.pdfIn PDF document text
    • https://phu-komplex.pl/pliki/file/65161658186.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/jatubomefoxedolar.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/tirujozisusuzokopogupo.pdfIn PDF document text
    • https://lesrimaudieres.com/images/uploads/file/mulilumanumemurexa.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16138e85b89bc3---37976901512.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/38240577470.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/27142350602.pdfIn PDF document text
    • http://mirsistem.com/depo/sayfaresim/file/nofomarod.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/88482481426.pdfIn PDF document text
    • http://fkhd.cz/data/img/mariw.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/50902517022.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/16494021138.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/5178098565.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613117dba2d30---ranul.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16139bb0798ab6---9162133257.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210910_0EB01A2A41C90B95.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/duwowegit.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/46283647650.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021090510512731.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/pupilidadokumodiwed.pdfIn PDF document text
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/wadep.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_off0000e5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D0 19012 bytes
SHA-256: 5d3cefef1d1429e92d9718ce890e9af741ad7758ed1df7c7f90a76527091d1cf
font_01_sfnt_off000117b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B1 10800 bytes
SHA-256: 11959982edbe4b22db3982dbf633502ef9b74d199cbc7779c2f2a0124a790a90
font_02_sfnt_off0001308b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1308B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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