Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebae3a6add6d8836…

MALICIOUS

PDF

93.7 KB Created: 2021-07-07 01:29:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e87dc58a0c6610888fca38e0da93ec9a SHA-1: 15b2b58d043d1bfe675568796da5ff47ec53d8f3 SHA-256: ebae3a6add6d8836cfadb5190a4ebcfea4c7a62666b94a666dcbf3f10ed576be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to numerous distinct hosts, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://sp3siemianowice.pl/userFiles/files/9499856034.pdf In PDF document text
    • https://itacademyindia.com/ckfinder/userfiles/files/gupilotupomu.pdfIn PDF document text
    • https://blindnow.com/userfiles/file/rutaparekixade.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16098358492ba8---jixivefalivotozoluseku.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/xizezepoxoreb.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/jrvu21qka3afqvvvq8c9p3eqaf/52928653441.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210702231246_03b0zl.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/af7cc34797601875ed5286ca26190551/5999695617.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160943b8dc64d4---niletekolojaxar.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/79b860e699907314d6f9a30696e73080/bezupuwutadujosogugunozo.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9de9b04b2---wuwusejaliked.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0d91e90cb---37228802810.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/wexobonurovil.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/28234054595.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/25786852338.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079308a97409---19090536029.pdfIn PDF document text
    • http://temple.mo/userfiles/file/jupofuniresexenowetulaga.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085872b75921---99640573534.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ae12df86a9b---wunenivuxuf.pdfIn PDF document text
    • http://cuatudongbinhduong.net/uploads/files/tusivuwasakemulo.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071652a97cc3---lilatevodibidixuxexof.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160bb805d27a97---56465289362.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070474165145---97752416992.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=best+paramotor+wingPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF396 17664 bytes
SHA-256: bc57dfe3584fc8b771dab6d80dd24856671c365be98712f4b79c1123dcc7b929
font_01_sfnt_off00012251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12251 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A62 16356 bytes
SHA-256: 32a61d067d170ef84ee3f83ad1ba2cadc23e725b0df5007dab6ea629016899fd
font_03_sfnt_off00015061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15061 10688 bytes
SHA-256: e7e8e41724bd21422bac73e3caf89f75133f51d26eb0a76e759c8a2f8fc4a524

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