Malicious PDF — malware analysis report

Static analysis result for SHA-256 a594ca2f99d29817…

MALICIOUS

PDF

94.1 KB Created: 2021-06-25 21:27:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ea29c7ca280395477d10503be913cb1d SHA-1: b4ab2ad1e3ea85f78b5d6e8d1440619bf367666b SHA-256: a594ca2f99d2981742b4be6c28cc1cdb2850bb125d3f8a4a45050b5c3c76b631
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites. This behavior is indicative of a link farm designed to redirect users to malicious destinations. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a72c9aa8186---22667421048.pdf In PDF document text
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/ce9a07ce9d4e1375610c517427e85673/gekakesa.pdfIn PDF document text
    • http://chongros.com/userData/board/file/20832155422.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607253a93d4cf---99436104883.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/n93tl99skv26hr93qg8kjbg8bs/rabemase.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/6aa57df87be1c35503b10947cd8ea7e9/xilegodisoxeforege.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b8a97abcf---19295975798.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/em7gsc7ao4gr9ghl0ok4q2oar4/95231861528.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/10c327c1da2d70cb7a8f3cbe910bbd6d/16584369298.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/87883958559.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/fakemuki.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/fiketije.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a28800eba6---bobanusotaj.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b07f81700e0---nosorek.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884fe04b05e---46219222634.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/1e6d54f6555be3c0aa153fcb815d4a46/20086734426.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/2otd2331qf6m4geq66qlopo9h2/85922041536.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/33093107722.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/20917390964.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702c2e8e7c4---xozolepo.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160d191041db78---81269789155.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160962a06aad6b---lipubekepafetuwub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=pressure+force+area+worksheet+with+answersPDF 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_off00010b55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B55 17336 bytes
SHA-256: d11e8a5abca87887b4099190672fb4ea5e43c2ea16b9b4e6afeade7a018cc8d4
font_01_sfnt_off0001389c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1389C 10664 bytes
SHA-256: 5f88ec0727ce304fafb702253c2270c0d422b0f47f80ae592c9fd5bb873c8d5d
font_02_sfnt_off00015123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15123 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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