Malicious PDF — malware analysis report

Static analysis result for SHA-256 523dde2b6825ef18…

MALICIOUS

PDF

81.7 KB Created: 2021-09-10 13:25:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a38aa1a2cc1f9623abc1bc4f3c4547a9 SHA-1: 10d20c71fe0e8be42d5a99c5426c3a9007473377 SHA-256: 523dde2b6825ef188faf3abcf145e4ae82672ee76af1b5b8201aee68013b38cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of embedded URLs and the nature of the heuristics suggest the PDF is designed to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crewmak.ru/uplcv?utm_term=26x30+house+plan+3d PDF link annotation
    • http://aallergy.netlovestories.com/upload/files/zupojezirekebivanilige.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134b8c1f0715---87193978167.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/94906985516.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/tiwevedexiwol.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffa10e314f---tokudiko.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/84463358340.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/kejuzogo.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210905215413.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/56750109619.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/10421265130.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/batimugadekadag.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/xoxogotivaporadizi.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/qm147c5kssuuqe3olbolvjlj2d/lepamuwitigedalofupilo.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/99763539219.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/pexope.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/vofewidal.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/dobogupevik.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/97703741902.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/mipimafifuzejirevugani.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/35243686998.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613788887b05d---59275397272.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/pedemededev.pdfIn PDF document text
    • https://futurefacesnyc.com/uploads/file/kowetuzumozelegizumux.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/21160389187.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134891bc9e1f---giletipekifabe.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_off0000da2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f23c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23C 17844 bytes
SHA-256: 24cdc09cd8aacc7b0d284e10d2bf98a27f96dfa234e240d59cee4dcdb8296e69
font_02_sfnt_off00012013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12013 10884 bytes
SHA-256: 2fa7447f4643b4638561f3309fd803785ada766393fd353ae1a3489d74b20928

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