Malicious PDF — malware analysis report

Static analysis result for SHA-256 29429fe6ea757e7d…

MALICIOUS

PDF

78.8 KB Created: 2021-09-02 20:28:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4948d7f003e49fa237a300b1e2973ff6 SHA-1: 6c39b2d98a40d50104c7675e5b49e6c58b0d5169 SHA-256: 29429fe6ea757e7d1a11cde74e14f3c4bab5a684c81ebef9be2dcd8e211fcfa4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://wastran.ru/uplcv?utm_term=medela+manual+breast+pump+vs+avent PDF link annotation
    • https://mimpiindah88.com/contents/files/88861059967.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b0043041c30---xitonu.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/79144495258.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/wudakejawotarenubeg.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/nisazipimarajubajok.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/30011683395.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/4360173a500e422019183dbe6057d5c0/zixuxivoguwu.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/6ff3e5a2600bbd60bf5ff45745f20c60/81684840609.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210718_04B81BB0AFBA4AE5.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/6644302064.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/wamuxanapepi.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/basapegefejo.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210803232123.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f23a9030b---negoxakisaxol.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd24f98764---sediramilotesujorake.pdfIn PDF document text
    • http://suleymanporoy.com/img/userfiles/files/bagavajemilo.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d092253d098---53788669226.pdfIn PDF document text
    • http://15881588.com/ckupload/files/ruginurenelunigi.pdfIn PDF document text
    • http://ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/mugojivulozulinewuxoteko.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/rewitukovemuvutorazulasuw.pdfIn PDF document text
    • http://firewaterdamagedfw.com/test/fckeditor/uploadfiles/file/42403958174.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/5c0ff0ca4f135c54079402ad60b883a1/27247145801.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_off0000d1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EB 10640 bytes
SHA-256: f56a7a7b6f15396e5091b967a5bee89f0733613209794dedbafca7560796609e
font_01_sfnt_off0000ea0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001021f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021F 16892 bytes
SHA-256: d9da784b75184fcd1d6ee043bed3402c3e347bca790df3c7ce0eda5b634b111c

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