Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ecb5dd49a8bf587…

MALICIOUS

PDF

71.3 KB Created: 2021-06-18 19:48:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 0616e8369bc1204df850fbd306621c95 SHA-1: 960f777e38a18fcf8839acfae0b6aaef71376627 SHA-256: 0ecb5dd49a8bf5871c86b43cb2f870b6a7344e07826cdb9771c2b500e40136b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous external URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://infrive.ru/uplcv?utm_term=tvos+13+beta+profile PDF link annotation
    • http://zwickerfoto.hu/_user/file/finirapiw.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/14718420675.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a47c776e476---48321556964.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/rp8ku7bru02002vtf0uho3stg4/85679735080.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210526013228.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/9fe74ec0e300699d918b791797b07242/14479979506.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/1239e291905b493fc6ecc76f070b2f4b/kupitimirasuwodumixofel.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/potip.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/664ee170fe1310c0d4e49ca4d87f3e43/nekub.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/f9248bf57c1d4b2868a5d3cb1909f32c/46430361451.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/4737336253.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607652ee37d43---guzajolokubegenane.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/0l9favo2v2rgq1ufvedssu498r/rowaki.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/20640556374.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/zanaxopiwogofakegil.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/21025803101.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d48a945b1c---vuvovajolefem.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c23b445dd---xizinidixaribolun.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off0000c45e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC45E 5260 bytes
SHA-256: 0c44140c214d1bd29d4fa1223089875cc61a543c85170b2bf731cce6891315f1
font_01_sfnt_off0000d658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD658 10476 bytes
SHA-256: 002b38846e1277a2ce7c8e27b80f893dcfeaa33f0f7f811f4542196d9b97dcc5
font_02_sfnt_off0000fa30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA30 16428 bytes
SHA-256: 10ae7a4fbc5827eca3bc9db17f6834b346abd083628d2a1846ffe091fb3520f2

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