Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbd65ec964201652…

MALICIOUS

PDF

84.8 KB Created: 2021-08-21 02:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 50b451671c7febca81becb23d3442d4b SHA-1: aaddbf8ba5dff4bfe491dbd02794972fb20f0dab SHA-256: dbd65ec964201652b9cd21b542ca2ff3b8eaf5ed9f415fbfa7843ae94d60ded2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a link farm pointing to compromised WordPress sites, likely intended to trick users into downloading a password-protected archive. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics, along with the SE_PASSWORD_ARCHIVE_LURE firing, strongly suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/d4870cf79d92ae9fe77bf99052163638/42471759607.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7369998cc9---vowasudelinusajabovapo.pdf
    • http://yuc-fac.com/uploadfiles/20210705085849.pdf
    • http://kondicionery-fryazino.ru/upload_picture/file/60589005407.pdf
    • http://erex.hu/upload/file/76667832666.pdf
    • http://shophouse.info/images/files/sisunugusonujavawus.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a0661af91e83008c8fbac155476fc974/fabul.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3394b11d2---62640073123.pdf
    • http://v-lukomorie.com/uploader/files/97862853718.pdf
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/b128042e45666158a27530e689fc3865/12016444521.pdf
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/lujesofu.pdf
    • http://tecsun-moscow.ru/docs/file/gopumuvugabe.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a6234842702---tudikujonimenuxolipijo.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7b64565c9---zasagikox.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=gta+5+offline+mod+menu+pc+free
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf41.bin
9784537f2169549c66d158db666b7d35abb494897ba3ca830927aecd2827dc3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF41 10888 bytes
font_01_sfnt_off0000e86c.bin
8dff6da324f1626c7e5f578b428db6a2d23e1f6788bb96a8304d8f59a061fc64		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE86C 18424 bytes
font_02_sfnt_off000117b6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117B6 16792 bytes
font_03_sfnt_off00012fc7.bin
32a61d067d170ef84ee3f83ad1ba2cadc23e725b0df5007dab6ea629016899fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC7 16356 bytes

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