Malicious PDF — malware analysis report

Static analysis result for SHA-256 0efce3acbed2274f…

MALICIOUS

PDF

90.0 KB Created: 2021-07-20 15:38:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fb5aa05c75e23f2a90d98e98ece8d7e7 SHA-1: 56517175033e23a07ca73ac663949181ab903b40 SHA-256: 0efce3acbed2274ffa89b7df48a72e6378069020f46c3acd3dc8eb515c725cab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/e41895a690766f869cb14a7ca25cde05/lizitatejakikewe.pdf In PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fdd9bfdce---13564283509.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/bupimijit.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/573f3824dca72302db1cb842c7e49811/jaresomuwidara.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/28963812460.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd69749368---lijalujadivugunagawiluw.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b7d2683ba---sipuxojevevatu.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/zidozaxojinerevoparuduku.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16080e0c2ea210---27701472232.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/jb3qt3hc4la92aadcqevaushn5/zifetibeveradibazibesasob.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/13094633169.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6789de018---motoloxogigutefitikizi.pdfIn PDF document text
    • http://redtopmarina.com/clients/7/72/7297c65379f6126c97b8b18e62fd1dd4/File/60379533540.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/gamudesorexojivi.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/judifexolemo.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607979899ffb5---3620273307.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/80453060858.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2bf296c48---rotiges.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608227fb41cb2---98713835805.pdfIn PDF document text
    • http://www.bash.cl/media/file/72018068790.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/6sr4ud4q6phl4ua4vu03gkpdv1/pimewukija.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747c089033c---pivul.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bda6f6382ed---zovegadawewogasu.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca38f1b7b4---23974056412.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=number+of+black+and+white+keys+on+a+pianoPDF 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_off0000fb58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB58 11392 bytes
SHA-256: aed8becd7e28332ef527d9cdd8f8cdc35edc42a0f19c49c28725eecb0dc9a204
font_01_sfnt_off000115dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012def.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DEF 17096 bytes
SHA-256: 1acbedb75d60b63a88ef4f6da0998076d5d0f9da1b6c782f588320ad54626f79

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