Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f210251357127ef…

MALICIOUS

PDF

110.3 KB Created: 2021-09-04 06:48:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c012b6072543b9a50337629e6cb98dd3 SHA-1: 2fda07e64058ccbb145b64ae4ca1493920f6fb1c SHA-256: 2f210251357127efd5f4489efa6f40fdc2ac589b779c1bb5fb24a9176d13157b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also contains numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9666

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hillcresthigh1971.com/clients/9/9f/9fbf9047a6869172a982db6f42f05a9a/File/7166430621.pdf In PDF document text
    • https://luyenthitoeic.info/userfiles/file/dedezun.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16085df5d7e31d---1186254471.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/bd68f6b2256e61ad72d10721d06b7734/23677391213.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c18abdbb88---19561385100.pdfIn PDF document text
    • http://jfe.hk/userfiles/33232890284.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf3b020c97---wokopuvupef.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc739b6a4b---63274347158.pdfIn PDF document text
    • http://thanhtindesign.vn/uploads/image/files/xedewin.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa4943eea08---wesezujawebekiziloxa.pdfIn PDF document text
    • https://granitnet.hu/editor_up/44196945107.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/46018532428.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/legabopawanovil.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/60851695178.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/pusavaxetigevebemela.pdfIn PDF document text
    • https://turbooto.vn/upload/files/poninegirenisaroz.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/13896874412.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/2a52872edd41c4cc74485e15020a788a/taximoxogegilalenura.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116df50e3680---47586186073.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/2e160aae71a68870e6f5058b1e77e1ea/89977502440.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac59347a14---12990440401.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/1a0c687ef0a58b53b1d1b507b9070e1b/6858856863.pdfIn PDF document text
    • http://hoctienganh123.net/upload/files/13329433913.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/fetub.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/dozofikobitugawove.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/qalandl7pdnaumlci9favu85u6/12178123091.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=contoh+khutbah+jumat+singkat+dengan+doa+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00017443.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x17443 30480 bytes
SHA-256: 10c4537a00254edaf4a3947dd4e1f6298742a9bcd0c4ea11ea8bb105f7c35ae2
font_00_sfnt_off0001171e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171E 17164 bytes
SHA-256: a9ea944e4bb86addd4f64d233b31d5cbdab1c88739f9c2e6bd092be1e9d96f8f
font_01_sfnt_off00014245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14245 11292 bytes
SHA-256: 15a5cf0d35b167d388fedf24e49c1e72dbe5d6f0c1c369f0fc6297704837b5b7
font_02_sfnt_off00015c32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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