Malicious PDF — malware analysis report

Static analysis result for SHA-256 6be89722d18dd907…

MALICIOUS

PDF

121.2 KB Created: 2021-07-07 01:32:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6c96dc88f99f152c78f61d2fbdfe0c70 SHA-1: 7a101dc5381093cb9606678fd25d2d18c3459ee3 SHA-256: 6be89722d18dd9073e57171a41ad1991a3cc176a4dcaa7a9b1f6df6fe220d2b3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm pointing to compromised WordPress sites, likely intended to deliver a malicious payload. The ML classifier and ClamAV detection strongly indicate malicious intent, with the document likely serving as a lure for phishing or malware distribution. No scripts were extracted, but the presence of external URIs and the 'SE_INVOICE_LURE' heuristic suggest a social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://drafthe.ru/uplcv?utm_term=principles+of+financial+accounting+solutions+manual
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc65d997ca---nebufexekuveteriv.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b711e77823b---59487817447.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160804cefd2494---gamunuzawoso.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a750619d1cb---40982831529.pdf
    • http://1960ihs.com/clients/e/e0/e0b58928a48036c9af8d6cfc9cffdd99/File/86923110519.pdf
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/022326036010.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/d5ef98c27f298a5f9939133b13dae85d/jurivugunogozenajibij.pdf
    • http://alemotta.com/resources/original/file/zajaluraputis.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/9891f6ca246386b63f128638a2f49ad2/tumekeposukadomarilax.pdf
    • http://alemotta.com/resources/original/file/totiwewo.pdf
    • http://antoniolescio.net/userfiles/files/sejemofiravop.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa0e4c0b53---vawajevaz.pdf
    • http://colorfulmedia.de/fotki/fotki/file/zisuveruba.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160965e821c139---jatojifor.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5cff6c4831---ligetuneratanejazobe.pdf
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/0b44ba8c16a6abb52294b04efc05415e/banujetavewuma.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720dbe83eac---davugofebivatufu.pdf
    • https://honda-otolongan.com/upload/files/94693613315.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/47a4f75a41a51ab2fb7c831c4b09ace9/3559055917.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/cee233c9be8dd85e03b7c50e7cca36d3/96915934366.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/091b9b0ebd87b7e664d5855a71f3414b/91774499375.pdf
    • http://anhuizpyy.com/upload_fck/file/2021-5-21/20210521124500203008.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d15897b91---12519390660.pdf
    • 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_off00017531.bin
4f9e0da4903dbecfe14d3739e6abba784726f1a8b35a7b408a1a98867954f2b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17531 10924 bytes
font_01_sfnt_off00018e7b.bin
f0c38e4a45a6313ca91fb748b1549a00929c0366ceb8b54db7ad3014e719d2a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18E7B 18108 bytes
font_02_sfnt_off0001be7c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BE7C 16792 bytes

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