Malicious PDF — malware analysis report

Static analysis result for SHA-256 a039649f5fb93285…

MALICIOUS

PDF

79.6 KB Created: 2021-09-17 21:35:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 115005530f8d5cb62503ac914b32aa60 SHA-1: dc271dacdb24e4b51803d5604b705924ea4c4c2f SHA-256: a039649f5fb93285bfbebefba1e90702c589571d71fbbbbdee1ff4d584c4ebe7
196 Risk Score

Malware Insights

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

The PDF document contains numerous links, many pointing to disposable hosting or compromised CMS uploads, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document's intent to trick users into downloading password-protected archives, likely to bypass security controls. The embedded URLs and link farm structure suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://auto4-spb.ru/public/images/ckfinder/files/tojijovaxowa.pdf In PDF document text
    • https://led7.ru/file/55063940720.pdfIn PDF document text
    • http://fundacjahfg.pl/upload/file/70636631094.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/7b8qt70cqsb7q26aedjc8q3ucl/35415343041.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/nipozorubevagilokolugad.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/44940223815.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16140dc441b03d---buwewu.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/topulexugagum.pdfIn PDF document text
    • http://hkacca.com/userfiles/modinarexozob.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/66549696235.pdfIn PDF document text
    • http://mgrima.com/files/file/80562007220.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/semitubetavibekodos.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/zotufitugofug.pdfIn PDF document text
    • http://khachsandomino.com/hinhanh_fckeditor/file/povutotoku.pdfIn PDF document text
    • https://enerjimakine.com/tsrm1/img/userfiles/file/ronodamot.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/desipe.pdfIn PDF document text
    • https://agermag.ro/mm/file/zofaximojujufemux.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/buxosaf.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/1564455545.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/vilasurivukadumufa.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/tilofekubowarulisem.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133fb0a912ba---diwoxidefobifitowuzesamub.pdfIn PDF document text
    • http://becskeicsodajo.hu/admin/fck_upload/file/xakudawawidajufen.pdfIn PDF document text
    • http://newworldss.com/uploads/file/72990062747.pdfIn PDF document text
    • http://gaineyranchaz.com/userimages/23361392989.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=zip+password+cracker+androidPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E7 10504 bytes
SHA-256: 2a626f877fb8017d3a0760acf40f82f9b844bb9a7309bc5db04fccdd3e10c006
font_01_sfnt_off0000ebff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFF 17492 bytes
SHA-256: 4751250df50586e25f760aadcfff0fdcbd897578c52ec27a3509410a2ff12d94
font_02_sfnt_off000118aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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