Malicious PDF — malware analysis report

Static analysis result for SHA-256 f606d8bd30cfc575…

MALICIOUS

PDF

84.1 KB Created: 2021-09-11 21:25:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 126ef68596f58e8fa960e251c0e6d5e9 SHA-1: 734b9e940b5dccfeee946a5420a9d98de94e4f67 SHA-256: f606d8bd30cfc57515bbd38146ee331bcae15355f3d9387e00088347e1a244bf
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including links to compromised CMS uploads and disposable hosting. The presence of a 'Callback phishing phone lure' heuristic and the ML classifier's high confidence score indicate a malicious intent. The embedded JavaScript and external links suggest an attempt to redirect the user to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 https://ketchas.ru/uplcv?utm_term=how+to+force+install+apk PDF link annotation
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/budusozojusogoni.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-8/20210908033824657653.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/pomawivobo.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/besipesitonu.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/makaresiwosewumenujisu.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/fevisoxopasoba.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16135f43b21e01---37451544266.pdfIn PDF document text
    • http://tvsatkrosno.pl/userfiles/file/96419278072.pdfIn PDF document text
    • http://phukientubepxinh.info/gomsu/sanpham/anh/files/50022994658.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/3618953555.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/81112259444.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/52f01d2d78327c5f2b33ef7e9d20efb9/20658130302.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/pimonujadagogegojomer.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/milizigeno.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/dukosofopadijuk.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/debetotavava.pdfIn PDF document text
    • https://mollis.rs/files/20317198435.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ec11cbc73---nodivamexutesisas.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/97728330404.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/kolowibitu.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/tanatakinevinevujuxeje.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/72304205540.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/kunowid.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/mejufiguvefekuxan.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/tadapibonudejefugebal.pdfIn PDF document text
    • 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_off0000e5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A3 17200 bytes
SHA-256: 4d9695bbc92de5ce87d31464d00254c729ed182d34423d6fc7bb4fceb886480c
font_01_sfnt_off00011259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11259 10640 bytes
SHA-256: bf32a1636238aa1860d21146851e4427d397a015e3f2fc249beed69191d2ea28
font_02_sfnt_off00012ade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ADE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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