Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffed21e9961045e6…

MALICIOUS

PDF

80.4 KB Created: 2021-09-11 06:30:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7a28c1700ca8067eeb8f0abf05c533b9 SHA-1: 4069a76f597dcdfc47d511a78e4ad0d0722773fc SHA-256: ffed21e9961045e6a9b1472535be0fbdef600e34852a5535d34ca318db8a1a1a
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple websites, some of which are hosted on compromised CMS upload directories. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The sample's structure and URL patterns suggest it is part of a campaign to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16136e5b79a310---68349963491.pdf In PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/6f48f9c60e0df53cd5e5741876cae8e3/mejogugad.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/rosonojexifavomisusawate.pdfIn PDF document text
    • http://cnex.cc/images/blog/file/pekusineminuz.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/69747945434.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/wedib.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/kiregixagapene.pdfIn PDF document text
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/11969619136.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/nb4rnnbr8dpkcql8of2rf7ubi5/kewow.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161381f26918d3---72163353739.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/sutagegab.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/wovokidotuboditow.pdfIn PDF document text
    • http://ariogalospspc.lt/userfiles/file/ladavapuzobapawubike.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/waponatopuleru.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/kikukejejuzo.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/xiwumunuzatudake.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/03aedfd750389f17ba7d095483bddd8d/fapomuxewonujuwuzok.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/wadekubakutanirizavil.pdfIn PDF document text
    • https://konchris.com/userfiles/file/1630804438.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613849cdd348e---99671468051.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/tisoxexumezew.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/6355647729.pdfIn PDF document text
    • https://kattliv.com/kattliv/admin/userfiles/file/tukaji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=all+dragon+ball+episodes+in+totalPDF 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_off0000d694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD694 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eeab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAB 10688 bytes
SHA-256: 161b56cfc40c84bf898f98a9d77750aebc56e9f49cdfa95d962031ad805ed76e
font_02_sfnt_off000106d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D6 17500 bytes
SHA-256: cd7ee6eff4fcb9b642fb08fd2dfdf91189ad295d24fc36e7608690ec43d61871

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