Malicious PDF — malware analysis report

Static analysis result for SHA-256 b17cb07f26079e4e…

MALICIOUS

PDF

85.9 KB Created: 2021-09-04 14:05:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a934873580f62b4d2e087a08b62741bd SHA-1: e8c625c0aec1d147fb8b2a81ad2dc883285f2126 SHA-256: b17cb07f26079e4eb16e4de3d5b6c4040888ada527102f186cac3fd952c578e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/7e3a148a219700e475d4bdb652a8a116/33021805819.pdf In PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/8270686797.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948903954e2---15616723705.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202108150217089233.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/raxesezaropevisamajemu.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/10317350377.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/c576fc76d48e7ba094dd9e4b263b5a65/takakofenowegowebid.pdfIn PDF document text
    • http://rwdwebwebdesign.com/img-aim/files/danesazoxizebojitik.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/98216290410.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/73e293baa1665b3cc393ddd8aa4dc27e/75133704046.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/33760464b2717360e04d4cb6279132ad/96995975251.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/fubetatowupujus.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/sosojapotelidesilugisel.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/zevamajatusupopezulol.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/94286573489.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/33581198773.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb7cff4b2e1---revudiwumenadumopat.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/g4m54umbatea4vqltdatnn42rb/jenuganivokixuzog.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/15416985504.pdfIn PDF document text
    • http://starlightcelebre.com/clients/4/43/43e9139217482d7666ce300faf566241/File/76714607565.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/fifisivu.pdfIn PDF document text
    • http://poorclarescork.ie/images/70697929399.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/dovetajolu.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/49898808710.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/jibasafugumewe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=spivak+calculus+on+manifolds+solutions+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_off0000e697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE697 10884 bytes
SHA-256: 89e0ca0af73db87b0f9ef63bded5c97eae8ef2c106139c8d9dead4d916d5f0b5
font_01_sfnt_off0000ffbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBF 18696 bytes
SHA-256: e8eef835c68d15cc0af64f0295a1ce7b1bfe60816fc13f6e2b5257cf6aa122b5
font_02_sfnt_off00013158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13158 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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