Malicious PDF — malware analysis report

Static analysis result for SHA-256 04a161f288086239…

MALICIOUS

PDF

93.8 KB Created: 2021-09-07 14:27:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1266cda235a61b09c32e5e50c292355b SHA-1: 3a20b1a357486e15e886ca8c6fbe528b972543b9 SHA-256: 04a161f288086239f20a7eaa851db8fa2a442ecb1994ea83a9ad6f2a5c339f07
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised WordPress sites, suggesting it is part of a phishing or malware distribution campaign. The PDF structure and embedded URLs are indicative of a spearphishing attachment, likely designed to lure users to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16087405d47f2b---rupodona.pdf In PDF document text
    • http://bualuang101.com/backoffice/upload/files/posutodovaridirufufibaro.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/a6ffjsal4s1h1ulpnlcpota8re/jidiresikodipewo.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/15fdfabf82640152c394f5c583b99837/63209957613.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/82311096869.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e46bf45846---meruzugatowomi.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/kujuzejibi.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab38e7e6db---luvurajufokamesesixetedin.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/d5411012942a5d3dfaf5dcdc3fb3b123/52051262792.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/806af47ef9f5b156859388e9a73fb2c3/7021550002.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/zawikusoxafunok.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/68654493084.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/93541576287.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/tewitapizoga.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/1564302160.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/447ac7a1e72ec3d2288e3eaddc276c74/rufasawoxinigonupe.pdfIn PDF document text
    • http://short-story.ru/upload/file/gulogamonovi.pdfIn PDF document text
    • http://www.siposferenc.hu/html/25873017889.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/kuzeposexafupirivanuti.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-7-20/20210720000109395120.pdfIn PDF document text
    • https://luminex.pl/upload/file/gujalametemaxujuzuwizumun.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/d3936d5da428e8c22f8bd4e2551c8b88/semowosilakux.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/32281191523.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bc2302d24---58698816726.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=html5+tags+and+their+uses+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD6 16672 bytes
SHA-256: e7f49990013c112a03deee8b879cc36dbf81c7aec9acab21a222229b2a65e4e1
font_01_sfnt_off000128bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128BC 16044 bytes
SHA-256: 7fffea9e129ada7ec02dce0e83c61fa674c6b6cb5bf14a83e1e01bfe0cee8a5f
font_02_sfnt_off0001519b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1519B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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