Malicious PDF — malware analysis report

Static analysis result for SHA-256 b65c51cab95f5282…

MALICIOUS

PDF

92.6 KB Created: 2021-07-22 22:41:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 37c4a4fe3d2770f894495c5b4114f990 SHA-1: f3cad3c4dd4cffb2d734c5d05cfae79260ad261e SHA-256: b65c51cab95f52822be8b638b60f1b456d5fb081abb49f1a6666d9ec642ebf16
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also identified it as malicious, likely phishing-related. Although no scripts were explicitly extracted, the nature of the link farm suggests it is intended to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://xo-sound.ru/userfiles/file/38027563134.pdf In PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/3dc43f1d7a7777463c01d6fb46102942/1451617329.pdfIn PDF document text
    • http://bayernglobal.de/userVZ//file/34232824300.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/5f103d4a89feddcba1e4099d6a2c2e60/92498709053.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0ec57a6ed---71734933692.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/lorevomip.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5bcea3add---52854155822.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/13138984357.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/833ac57a3135e8f3800f27a74d65cd91/vijujapiparawafikugamu.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/nunogupewivadudipo.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/92003393774.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/ed775dea03ca88e686553e576c46e8f1/39331207807.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/cf180d36cd13ca2c5f38252f10cf5b61/72573022419.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/jufoxulejewuxirok.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/pejezalovitizi.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/a2e2b0bcd1099945f2a67e3174d88bef/ribidudelomu.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/b736b7ejpr4ps3bdfpnbtna4g9/wonawed.pdfIn PDF document text
    • https://clove7.com/userfiles/file/gigeguwapibofa.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/sokafuvemi.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/43808471430.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/61500301422.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/461a38e549243dc94efeff60fc645027/75220857902.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/10098721556.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=rayleigh+jeans+approximationPDF 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
font_00_sfnt_off0000edb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB7 16164 bytes
SHA-256: 75738728b7fa6e73797aef2e012fd78251cbc9d65ad8c5883fa7f989806421ac
font_01_sfnt_off0001032f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B41 17636 bytes
SHA-256: 06aa727d8616daa13330608f5f0eea6a8283b614ac5f9f3ec6b5d5df86a294ba
font_03_sfnt_off000149bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149BF 11088 bytes
SHA-256: c7c866028fb90b89768706ca7a62fedff9710b683093c7dfbd2bf33205dde0a0

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