Malicious PDF — malware analysis report

Static analysis result for SHA-256 232d4da3f4d1cdc1…

MALICIOUS

PDF

78.5 KB Created: 2021-07-03 20:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cb67b1ef74e5746a5ab40c8c1fc3603d SHA-1: 23872826bdad8a139d9a1f85c62f2ce0507d5eb2 SHA-256: 232d4da3f4d1cdc1ed9f16990c0f92a6ea59b13f8239ba02d4cf4a78bb456749
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://mea-travel.pl/userfiles/file/wazelago.pdf
    • http://cesishotel.lv/res/wysiwyg/file/65334268913.pdf
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160723568aec22---roxuzejikowakovelopedi.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160742ef8e49e3---laruleliwo.pdf
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/i30rn0oaipds8o22d8gge4bkcn/95082691063.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a66c470b8.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab60b627563---tumekenuwunel.pdf
    • http://daydreamspin.com/userfiles/file/tipefa.pdf
    • http://prattsofdouds.com/clients/d/d8/d85aab9f4bcbae69c8358f7a9990a0b1/File/firinavugaguwabes.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c8263334f---53285943341.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/79f4e8b590a4919abc4d992b67d18b6e/wukolanubivedurusina.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/40f6d15b6315933575a61c45da893914/45132149855.pdf
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/5d00da918cd458b913aa0952fc0458cb/gupusuropolitekarokok.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607290cf15c51---35346729956.pdf
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/b84314098c8881451e59e41cc18898bc/96270086540.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608388072cb63---kanobedumosufuwisu.pdf
    • http://2478.ru/admin/ckfinder/userfiles/files/68055047601.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/eafc76ea1458ebd352138ec9acd28877/rutefipida.pdf
    • http://alexhoffordphotography.com/temp/files/file/41883140257.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e76b10ef29---dasodedepofafa.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160892f9aee6fa---pafixuvomiripodibex.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e0981dbe3---lofilawetiripogudin.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070cad15ef29---36066388789.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da012193444---58502517041.pdf
    • http://evpltravel.com/xv_image/file/nurolivededosidix.pdf
    • http://polkovnik.su/upload/file/sodufalejiju.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=phq+and+gad
    • 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_off0000d1c2.bin
ed67b0b3e5172ae3e970f33804700eceea2a3c73c8ddedc03cf01788a7cef41e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C2 9916 bytes
font_01_sfnt_off0000e6e8.bin
c02e2fa0a6841ccc227fc082df2a5206f001da66b44fa0ac475558f24c7c34c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E8 17700 bytes
font_02_sfnt_off000114fb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114FB 16792 bytes

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