Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a8919963943a92b…

MALICIOUS

PDF

88.6 KB Created: 2021-07-22 02:29:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 18baac10889db5e7790701c6ee7d22ce SHA-1: 0d30b0fe2fbec97c8b29089facacf79ce4b5fb6a SHA-256: 9a8919963943a92bc24d55eb84f94f9576c55b407f8bbcf115f9a7deec76986f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. The document functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting. The presence of a 'download button' heuristic suggests a lure to trick users into clicking these links, likely to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://zoltysnieg.pl/pliki_wyswig/files/64283319686.pdf In PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/eb22edc2acb4f76c606adf7c2734efb1/xawoze.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/kemevoxamuwev.pdfIn PDF document text
    • http://expresskaliski.info/file/wojadiz.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/93164969285.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/c04a911d65f40ae6f1f333a90650929d/zazodimujazasiwire.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/2541887311.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/537cf77c8f5a995dc3a93f77ba4585f4/44597405041.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607622cf74f46---84202481879.pdfIn PDF document text
    • http://wahiclassof69.com/clients/874294/File/34507024133.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/84f446dffefbc0ce2be841c861638668/nurod.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2fa9252b64---56332842710.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/1fe14a3ce45d08dd0d2557748170ff84/41901499541.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/38258709732.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/wugoserasemezezesefezalen.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/d09ml5938b3fmgadnrr55dsu2g/vonijemurevabumajaj.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/42095bf26287bcadbccdea62c9bf89a5/xunesopi.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/nifoxagamepiwe.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/uv6ejjcm9mpbu9tg02mbf7as24/sivizilu.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/jidutoluve.pdfIn PDF document text
    • https://turbooto.vn/upload/files/608599072.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021061123485073499.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609b75295a514---73101775476.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=class+5+science+questions+and+answers+pdfPDF 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_off0000f4fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D15 11112 bytes
SHA-256: 1edcc569922639798ec385212c4e082a049efcced7790602346c48f3613e8e34
font_02_sfnt_off00012704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12704 17220 bytes
SHA-256: 9d49cdb31a9a79b6d79fd7d82b83a7d7b29830f2209f03fea85da55d07c8941f

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