Malicious PDF — malware analysis report

Static analysis result for SHA-256 30792e83b804c5fd…

MALICIOUS

PDF

84.9 KB Created: 2021-09-06 19:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9e6de0d029bf0c69a1f413e0591bb654 SHA-1: 021fbf679eedec3c102f9b70040e3dd01209e3fc SHA-256: 30792e83b804c5fd0021dd2734b739dca69221472e87a91249236be36fd36feb
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs, several of which point to compromised WordPress upload directories. The document body is unreadable, but the heuristics indicate a pattern of directing users to external sites, some hosted on potentially compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://iburgisidimarsala.eu/userfiles/files/kumela.pdf In PDF document text
    • https://nurea.se/currency/userfiles/file/suzatozagimikorujitabuta.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/5f9f3a3763fa8ddd5f032ae4ff9846f7/2685256646.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210601183702.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/10982783563.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/ruwelidonikalegujuxebuvad.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/qhfq4pdt94afuj5r315djgdku6/jojalesopubimuda.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c73e8a2b84---pusolasojebewunelaso.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/99812119238.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210808_082956.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c379b3012---sunakeg.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/5ed67049651cb0736a013366cdfbf372/nijilawa.pdfIn PDF document text
    • https://giustofiori.it/file/guwimakididizemibusiz.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/8bf643c272e5f211d47a74f9204baeef/37399699221.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/vasoxelobabijowiruximo.pdfIn PDF document text
    • http://1959blackshirts.com/clients/866684/File/41975413626.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202162083558309.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/peboseripugunezun.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/fixifawugowuvawiga.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b03e69b6fc5---lomopowurudogemodelo.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/jizorijujawuk.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/fomaligorojuwo.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/6034335007.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=2014+mitsubishi+outlander+repair+manualPDF 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_off0000df86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF86 19472 bytes
SHA-256: 297aacdf28ac6fdbe85bc601e48d3bd5434d0d1e087521a29a41d98c2ccd6747
font_01_sfnt_off00011211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11211 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A28 11172 bytes
SHA-256: 7aa68937daaa1a9e15d91f899d28a20739a360c0372783825c28df1314225bc3

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