Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5578fe5acddaf51…

MALICIOUS

PDF

85.7 KB Created: 2021-07-03 00:23:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 859854cbcbf30d099e7477b82471282a SHA-1: 1f80bc6a42081c7c698e3d04904bea59a7cd59ca SHA-256: c5578fe5acddaf514e907f6adb3cd54a1a34cc3f47d19af93794def5b75c46ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://drafthe.ru/uplcv?utm_term=attorney+esq+meaning PDF link annotation
    • https://adepotcustom.com/UploadFiles/file/20210430102526166.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/6d8a66163a2dec60a27365d4d77c8bb0/jefoniwena.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/56372416955.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/jevoripimizetuwitifi.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/2i8qkhhqhm3k0bdf2ci4p7mr0s/19411998036.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/14368467530.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/vafuxapuzudunosu.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/dadfe15badb0e67f9d36ca1575c05189/78121383657.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cc4f38cf5---20060189769.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/mep77b15odbu8p7pc08bmg2mn4/nijupol.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d73d54c6b7b---fizaxamuvebepezugafuk.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/letapobibepugis.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/frifvuknfttg293nsvpeudbg21/gagedamaxen.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/120qr9j36lp6ksj4na08fg2vu9/bezuji.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/3581351151f9d6a0612c5d384bc1b33c/samazadumusokajiriv.pdfIn PDF document text
    • http://amdind.com/userfiles/file/nezoletorifidisoge.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/60533560992.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/gudodifefidebi.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/871f20882325cb4b843f25e98c0b3d37/66924560696.pdfIn PDF document text
    • http://davidlbrooks.com/clients/868292/File/47599065861.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0110e8596---16837908495.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b02c75fd9c---87971685721.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/tifetunuxuriragewezidaxus.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/0a899d293aa7bca3f79533d5e16e4de9/vodakafuzukap.pdfIn PDF document text
    • http://jeremypourstarlight.com/clients/5/53/539822683240d2210db56c0084569a8b/File/58270191396.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_off0000ecc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC5 10644 bytes
SHA-256: 2332398a940614e23b4ef3974ba9c3832fb4558dd8251692a756f6c7d217db45
font_01_sfnt_off000104e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF4 17296 bytes
SHA-256: e29d87dab85ebc4eb8e48fefedbd951d359612ceb4b8f2c3aedc09493c4f831b

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