Malicious PDF — malware analysis report

Static analysis result for SHA-256 0937b9425db3d400…

MALICIOUS

PDF

93.3 KB Created: 2021-07-01 09:17:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 36d573d726bef87f6e31180ad4dbb062 SHA-1: 3ab6cc7054623bb81ba884af60295cca775ab84a SHA-256: 0937b9425db3d4006c05d2f7e9691940101b34130fc2dc7acb0c707d542b5638
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the nature of the heuristic firings strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160762e5fc2720---25547016092.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/f4f121d08849026eba887c042432fdb8/sozegolep.pdf
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rumidoxenavigenalefum.pdf
    • http://lucann.com/Upload/file/vizavidamanaxirilo.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/4255363825e167a6ce251a6e5daa7b60/juwizijakate.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bec41de9f29---gitekuxodef.pdf
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/30d9c9ff3f3140df389bc6e59683d67e/tapat.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6a85ed47d---mexivipipupazibosun.pdf
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607573d77adba---25509076683.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/ovrudrdup3lfphi8kkmfq6umdi/35277703687.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2893100db---vumebepekakobevedi.pdf
    • https://termocasasrl.com/file/24990841640.pdf
    • https://irrisyst.eu/files/file/pejizodokomadagawifefa.pdf
    • http://biaikatolikus.hu/files/file/89723899087.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a09b082fa2b---13167724683.pdf
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/8de91141170e2ccbeae5f6e535dce924/76745098451.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608edf6ed5ae3---61251970240.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/2381a4ff4122c7c2fd65dcb3be4d3343/40835017289.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/6ea23822f9ef793acb83fb122b1cd0d1/95629020671.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d3ab0bf12cb---nonugukowedibelizuxaguse.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/6adbc8797e2e20df7f5b46a4cc5ab217/92268937251.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/6b591c3674f1a8b19ed5908e744936a8/xikivabugelitimapeketuv.pdf
    • https://aihr-iadh.org/uploads/FCK_files/file/70386767611.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=c+language+interview+questions+with+answers
    • 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_off0001089e.bin
aa821a3da4a716954fca90f4dcc473d1404a030ac9ab9a5c2a2e3943b4418e6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1089E 17636 bytes
font_01_sfnt_off00013713.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13713 16792 bytes
font_02_sfnt_off00014f2a.bin
5a379b6169076d3c155ce86bbb77797f4c6556c3fee199f8c5244b4da9614144		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14F2A 10816 bytes

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