Malicious PDF — malware analysis report

Static analysis result for SHA-256 88b66bad2170b39f…

MALICIOUS

PDF

79.6 KB Created: 2022-05-11 15:58:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-04-02
MD5: 92e85aafa7167f63cfc90d1514309766 SHA-1: 18b71fc389f1d38aaa6d6f815d714f5397f88f3d SHA-256: 88b66bad2170b39ff90740d8108b8b6b2faf64104b1b545cefb2c5d7da104cd1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and a document body that appears to be a link farm, likely intended to redirect users to malicious websites. The presence of ClamAV detection and ML flagging strongly indicates malicious intent, with the primary goal being to trick users into clicking these links, potentially leading to phishing or malware downloads. No scripts were extracted, but the structure suggests a phishing or content-luring attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://yijianjiance.com/userfiles/file/20220420155537_1376665009.pdf In PDF document text
    • https://tusofala.weebly.com/uploads/1/4/1/3/141340244/5136868.pdfIn PDF document text
    • http://homeopathyhk.com/files/9440805163.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16210cb0ea7366---85452611216.pdfIn PDF document text
    • http://hosma.net/upload/files/69623755074.pdfIn PDF document text
    • https://lafezarawowaw.weebly.com/uploads/1/3/0/8/130874252/3499851.pdfIn PDF document text
    • https://bizepusenovub.weebly.com/uploads/1/3/4/5/134509919/8833397.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/55188496513.pdfIn PDF document text
    • https://www.apsar.es/assets_back_office/js/plugins/kcfinder/upload/files/fonoxar.pdfIn PDF document text
    • http://rayer.cn/d/files/foweruxivesidusodif.pdfIn PDF document text
    • https://dulichduyendangvietnam.com/uploads/news_file/gewabigibir.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/porokuxu.pdfIn PDF document text
    • https://budamasut.weebly.com/uploads/1/3/4/9/134903336/9395bd796ce000.pdfIn PDF document text
    • https://dimofusuraz.weebly.com/uploads/1/3/4/6/134677966/207016.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/53920249968.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1626c977a4cdee---kesijaneximof.pdfIn PDF document text
    • http://simp-q.ru/userfiles/file/magawoxixogaketememidolu.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1620fa62e9c335---dezumimut.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/3f78df3095745233a06751983b5e4b1f/52732139891.pdfIn PDF document text
    • https://guadix.co/ckfinder/userfiles/files/melegigowanuz.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/0946591d70a58d0a6bebbfec8e66d01c/rujexadomelegufibi.pdfIn PDF document text
    • https://fecuq.co.za/YmrXLWy8?keyword=archie%20comics%20value%20guide%20value%20guide%202020%20calendarPDF 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 extracted file (font_00_sfnt_off0000cd3c.bin)
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn extracted file (font_00_sfnt_off0000cd3c.bin)

Related samples 1

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3C 18452 bytes
SHA-256: 147eb56404552e975cd99a9103ba583dbc97663e633e2b9ff2f2393d1ab1c973
font_01_sfnt_off0000fd2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2C 11108 bytes
SHA-256: f50222a32dd560cc7569c6bc1cc57154908ffbfccec743cd83660bea08777ac5
font_02_sfnt_off000116c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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