Malicious PDF — malware analysis report

Static analysis result for SHA-256 7af2e38da069adb4…

MALICIOUS

PDF

68.2 KB Created: 2021-09-24 06:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 53634ab687424c58e3d575220c89db9a SHA-1: 0ae35e804b706cbb24d08c73e4a836cea41f3714 SHA-256: 7af2e38da069adb42788618a5d359cf711e8808891745801eb04323d87959271
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious links, which are designed to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • 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.
  • 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://www2.grupoksl.com.br/js/ckfinder/userfiles/files/53230416057.pdf
    • http://liburnia.pl/userfiles/file/11281567790.pdf
    • http://studiozammuner.eu/userfiles/files/figejiwu.pdf
    • http://www.amedna.com/userfiles/files/renumipuxebebisaweriwu.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/oqfur1mpr5fatu22fobf0qkjlt/91801868265.pdf
    • https://hotararicedo.ro/files/files/78083201406.pdf
    • http://goodtraefarm.com/ckupload/files/wusevoninetijisanu.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/989ca8f9d8170ed5de3d759d2656b10e/73956356697.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed4b162db2---59001992273.pdf
    • https://safetyhanoi.com/userfiles/file/jegakebofufeto.pdf
    • http://homelife-superstars.com/image/files/ledazonitilufuxijet.pdf
    • https://arbormaster.net/uploads/files/pujuwe.pdf
    • http://draftingfloorplan.com/ckfinder/userfiles/files/86806699517.pdf
    • http://martonelektro.hu/files/file/24886238625.pdf
    • http://styropapex.pl/userfiles/file/zakex.pdf
    • http://rulife.ru/ckfinder/userfiles/files/wakareradaxobirazenemen.pdf
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/vefekoxoranilol.pdf
    • https://laznia-radom.pl/userfiles/file/dekujuvipe.pdf
    • http://investgeorgia.ge/userfiles/file/zikosowebanome.pdf
    • http://brenno-tojestto.pl/userfiles/file/lobopi.pdf
    • http://surveycook.com/upload/tmp/202109/file/74106938135.pdf
    • https://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/zologewela.pdf
    • http://hkxhjfc.ltd/uploads/files/20210911151023.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=2+player+games+on+ios
    • 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_off0000adab.bin
90d2d293bcdbe17840d466753ee134d74929b83e20a8f15a856b871a53bbdc65		 pdf-font-stream PDF embedded font (sfnt) at offset 0xADAB 14856 bytes
font_01_sfnt_off0000d358.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD358 16792 bytes
font_02_sfnt_off0000eb6f.bin
5a15bbe693f653907498e3403bb98f62d57594e3b230359bb09913c631cb4b41		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6F 10632 bytes

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