Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9cc573ca9d397df…

MALICIOUS

PDF

88.1 KB Created: 2021-08-26 22:14:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 8222da0c2636526afd6de31a11158cc9 SHA-1: c23f0eae00e22810524ebb0eccfcc32c3267c2a3 SHA-256: e9cc573ca9d397dfdd27de442c83de91d70a1453573967f1d644cb91f64ab4cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple heuristics as a link farm and a potential phishing or trojan delivery mechanism. The presence of numerous links pointing to compromised WordPress upload directories and disposable hosting indicates an attempt to obscure the true destination and evade detection. The ML classifier and ClamAV detection strongly support its malicious nature.

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://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099911c8a595---datakikawoxes.pdf In PDF document text
    • http://martonaroniskola.net/userfiles/file/borufisukaxideki.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/93858995593.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/xigimew.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/r6cjd4v2335prkkm7k1t413rbk/8844346890.pdfIn PDF document text
    • http://orthopediedelft.eu/files/72747072463.pdfIn PDF document text
    • https://kildevangen.dk/files/fubutukadizabu.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1629040656.pdfIn PDF document text
    • http://flexa.cz/docs/file/18353551923.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/8f4e634894fdb50a826d77d35aedf05b/rozel.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16120cbf7e491c---16974776444.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/83467813054.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b8496a907e0---60189050451.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/7811594239.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/lemetinavijupino.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/tadexotiganefilomuge.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/rfs24fc8jgs3p711kmfj9r3814/63917909973.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202108/file/1627776778.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ac37101e548---94500826013.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/33741107550.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db1feb8b5f---balim.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607c40683c086---94166604984.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/55831ef21e8ad5d512c5c5d039a7b042/fosofarulabiwewunojedati.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=women+prophets+in+the+old+testamentPDF 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_off0000dbe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE4 16708 bytes
SHA-256: 0a06da38ae535f20caacdab392401f99498afe2699a436bbd004a593cbb6d7e5
font_01_sfnt_off000106f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F7 17400 bytes
SHA-256: 1e51b01614ac782a8878b15b969404944ce31d72ca40a68019f71b905b1894ad
font_02_sfnt_off0001211a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13931 10652 bytes
SHA-256: b74271ac62fec7dd3f1ecacb43caaa46ae5ccfa7208793c5c68c848606943154