Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd8a7a0a0d24a63d…

MALICIOUS

PDF

79.5 KB Created: 2021-09-13 12:12:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c91528cbacecd86d42f646a6a8ad0f8a SHA-1: c5ba964edd2b369e079b9afca082b93bd2370482 SHA-256: dd8a7a0a0d24a63d8fb781240e4cbef7651389b03cbf7e5d8c81d156e63229cb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised or disposable hosting. Heuristics indicate it functions as a link farm, likely intended to redirect users to malicious sites for phishing or malware delivery. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/razisazurofemuguf.pdf In PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/rajinebidojodizaxovup.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c864fe4b13---28429363515.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/wuxurexozusobokivoxi.pdfIn PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/wokuwagabirefigef.pdfIn PDF document text
    • http://xmzs.org/userfiles/file/13709783173.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/2789648502.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/11803566150.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/nujenisaxo.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/luribusesizisaseden.pdfIn PDF document text
    • http://lagrupacio.cat/file/zupelinug.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/duvakigijofidudigumozig.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/3e3f44306c694c8f5de52aa929ec1143/29676723771.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/14410068318.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16136c903019aa---10929521116.pdfIn PDF document text
    • http://meta-min.com/files/rujasi.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/wubotarivifidifufexu.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea400c792e---sidalovoral.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/420361a6b8654c5709c78cfad757a2b9/lusagivejetizipatedawim.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/4067284982.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/53296965620.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/56839939582.pdfIn PDF document text
    • http://istvietnam.com/rich_editor/file/lafixu.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613239af89c60---deninavug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=watch+mulan+1998+online+freePDF 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_off0000ce20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE20 18840 bytes
SHA-256: 5a31dfb22424a66182f3b2586fb6f52690f0d0e4a6d69cdf5d166e34cdb02d7f
font_01_sfnt_off0000fecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECD 10952 bytes
SHA-256: 3f6a9ecbe8358e17beea780e5ab8e2eabce707083f03da5175bfe0e3399462e1
font_02_sfnt_off0001181e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1