Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3984e58fa0781d6…

MALICIOUS

PDF

120.9 KB Created: 2021-07-05 17:07:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6c27723902d147ce55c804ea637bbfb9 SHA-1: b2533fcf49beaac9cedaec8cceac0c9b28ffd7ab SHA-256: d3984e58fa0781d6cb7fbf2c58fb7e7fa2f3b44c0931c78a23433626cbea306d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload directories. The document body is heavily obfuscated, but the presence of numerous links suggests an attempt to redirect users to external, potentially malicious, content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608925ed3d497---memajozukilisonunosu.pdf In PDF document text
    • https://agentcctv.com/userfiles/file/gojula.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/8caef7e27f99eee8cf7137bc16c9595a/8423912466.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/69b2df40ad21b59e75efda2ad64a6e02/xibisusirudimoluzumofal.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/beuju89ekel8d4r8h41m5mn9jo/4396397968.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd1a86de4f---natumurux.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c339d5a191c---rojolodakubeboginoza.pdfIn PDF document text
    • http://1960ihs.com/clients/e/e0/e0b58928a48036c9af8d6cfc9cffdd99/File/84608715460.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080fbe31cab6---xemurefezuwiwoxafokiwa.pdfIn PDF document text
    • https://mfdesign.hu/files/file/zitaleneto.pdfIn PDF document text
    • http://medi-sen.com/files/files/70137390956.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/dexupusefujaxajetuga.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/32f5d8b52dcaaf49008939658a638706/14941325708.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/0e120b3e63b9a495dd5150243f44ee18/zilamuwaxunopizopeba.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/10j8md3bv5edggjhnj14pq64l2/80023455177.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091e42c43dc7---fubumefobugede.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/87128427431.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b3781245bb2---kugofobedagigudej.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/83307422003.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085d66005537---54123823549.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/a34d2db7a2c9bfae21e7c277516a761d/28899091414.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/39788259577.pdfIn PDF document text
    • https://zenkenmoshi.info/images/files/file/lufavajo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=deterrence+theory+crimePDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/jezurotebiveruzarakilode.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_off00017967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17967 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001917e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1917E 10232 bytes
SHA-256: a3150df08e7efa04574f8394f57f1181de59a3187f8ecf3a3af68dbe306e9cb0
font_02_sfnt_off0001a846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A846 17660 bytes
SHA-256: eee2bd9775bcd452d041a19958d0f02c515dd5b059f8c600d36df74ae1948f6a

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