Malicious PDF — malware analysis report

Static analysis result for SHA-256 972fbe885d823567…

MALICIOUS

PDF

94.8 KB Created: 2021-07-13 23:27:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 44c78535ef9d9bd8321e7e2d9d8f7ede SHA-1: 040eaf2e10cc1af2ec92d7260956ee965f11f410 SHA-256: 972fbe885d823567fb1676dfd1a833c8e9eb8feef007ac4c38eefd3e1f3101e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

This PDF was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The file contains a link farm pointing to compromised WordPress upload directories, a common technique for hosting malicious content. The presence of multiple external URIs and the nature of the link farm suggest it is designed to redirect users to potentially harmful sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773a9f0ba95---lejazijemexivakoza.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ddf921a44---3581619864.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6da212bac---26939087843.pdf
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/94571147656.pdf
    • http://teechart.com/uploads/images/files/wifab.pdf
    • http://sillajen.com/fckeditor/_upload/file/kabajizetuxig.pdf
    • https://indikino.com/ckfinder/userfiles/files/39031272706.pdf
    • http://mujuerp.com/uploads/ckeditor/files/20210616031847.pdf
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/79144411532.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608fde697945e---53425779038.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160cc74e0f3959---zesijaziwomudixow.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ffabdeeb0---vubedagogivuxubo.pdf
    • https://akemi.ro/hirek/file/wudeg.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d91bf2f9db---tonufixagi.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad91f3aa695---2188907363.pdf
    • http://kcde.kr/userfiles/file/kagadobedesub.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088582092be8---tukudusa.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d31fa1969---nubunasesezivijos.pdf
    • http://lucann.com/Upload/file/71978462522.pdf
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/f6c9027cf30445e499295f6d5277ee93/rumesokezurepik.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160960e15ed79a---nukegasejo.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/a3943de775b47b09634b012dad4c7fc9/97672357677.pdf
    • http://kzlo.pl/fotki/fotki/file/61169100899.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160e0a96028889---93611279686.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfc1819af8---likajijonefebenina.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=in+the+heliocentric+model
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000113ce.bin
2ddd8425668727cf633f57cc09aad2ded988b5319206889e1cce9bd6bf0996dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113CE 10256 bytes
font_01_sfnt_off00012a8c.bin
67c84f569d9f28718b52db0d19aedb4bc9be45469442f06554d6f146210e01a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A8C 16588 bytes
font_02_sfnt_off0001558c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1558C 16792 bytes

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