Malicious PDF — malware analysis report

Static analysis result for SHA-256 d827abb6f6478480…

MALICIOUS

PDF

77.9 KB Created: 2021-09-08 00:44:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 028cb550a1a571ec4f24167244785b70 SHA-1: 724bfc9c3ce9386e9df915c786a02d776104d0e9 SHA-256: d827abb6f64784803e79a9a69868d9f645f31110cb29b817c0cd13636335451c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links, combined with the PDF structure and heuristic firings related to link farms, indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://monktonlionsclubkidscamp.com/clients/9/99/99b8b5517e5fb663501b7ee5137ebf55/File/zumigaxo.pdf In PDF document text
    • http://iehyun.com/editorupload/file/3848951949.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/dujozomis.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/nizabefaneker.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a90a5c85aea---xixafewelevu.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1611877d482d0e---11727317401.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/toberofaruwugadubipalerif.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/zupatufozopuduwibosa.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc59b2ca6e---bojevadogubokodegin.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94190523238.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884e9b088a5---mopimujidejukixefaluken.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210614041411.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/puwuf.pdfIn PDF document text
    • http://gazetavk.ru/img/file/refajifurijesapetuta.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/latitowifagofuk.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/rukufepi.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16115ab5b5084a---4912707312.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/19522591068.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/71186407497.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cdaf8bdc8---xirejejewisipo.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/17869513255.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c0053226c---tevebadelulawiludezesod.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/fagad.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/poh78fn58n65i6jrgf8rt6g6o3/26673791562.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805192ac8d6---wujesonizakararizajagogu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=xps+to+jpg+converter+online+i+love+pdfPDF 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_off0000cc0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0E 17108 bytes
SHA-256: c22e80b257547e53364d7c48212d9df9fc889b90f251b783310716bd5e3800e7
font_01_sfnt_off0000f82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82D 10836 bytes
SHA-256: 9259d8bc68cd1443961e16c064e42f89793817aef7bcf5bf51583ff6b1069c66
font_02_sfnt_off00011117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11117 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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