Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dddebed0bb2e070…

MALICIOUS

PDF

83.9 KB Created: 2021-09-04 06:35:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f106ce542cebe26b2cc0f4442406294f SHA-1: 680343803db9950512a26cd8181d255deb5dc1f7 SHA-256: 5dddebed0bb2e07003e22cfe5592a57b51273a2c6debacb072c7130abcc386eb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs pointing to compromised websites, including a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to exploit vulnerabilities or redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://irisapp.cn/uploadfiles/fckeditor/20210513/file/16209104667651.pdf In PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/sogokabav.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/64842253888.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/u5plie3gr132i6qgvetdq7pen1/ratubogamoberuxadobiw.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/2dd1a78b62d824680a536c563ec71428/sabor.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0e0861669---59774651215.pdfIn PDF document text
    • http://northcity.rs/slike/files/60981898784.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3be4ab20e---mamiwojovoguwuzisafar.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/loxifawenanidavafuzidodip.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/95603329821.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210709_112514.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/1c07e073b05928b72872a6a7b9f1f998/jajikuvor.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c3fafea7435---nononu.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/pirabawesufemagina.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129478e31ae7---40366942443.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b61c5acfe---webovigaxikelemuf.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/fefomuguvaxosogafifux.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/tddb4d5oqp8a5g2m81akqocvi2/watojorurexapepegoli.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/jegekufisemitez.pdfIn PDF document text
    • https://spacio.hk/attachment/file/87956552445.pdfIn PDF document text
    • http://fullx.net/files/86609793682.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cff251dfe9---xaxotimororixazibema.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/90978610111.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=neoplasias+malignas+de+ovario+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_off0000dde2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE2 19724 bytes
SHA-256: 5b759f5d97082dfb85a40e8d1c34b8738c407b74b51fc740b28c9a90101dc2da
font_01_sfnt_off00010f84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F84 10784 bytes
SHA-256: cc7454bf7f05375144a3d993e3144ebaf87d0d73de17bfec13d9bf273a4547f2
font_02_sfnt_off0001281f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1281F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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