Malicious PDF — malware analysis report

Static analysis result for SHA-256 890947e8b34bc034…

MALICIOUS

PDF

72.8 KB Created: 2021-09-03 00:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dec15a1a1d97abc4c075aa7be7a31314 SHA-1: bff5f395c0a2817fb7be1ffcc3545b6f42a5554b SHA-256: 890947e8b34bc034c7efaeb0ef72badcaa4748a89e16c56ac65a2bee8061587d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS upload directories or disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious content, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://crysiq.ru/uplcv?utm_term=cbse+school+books+online+pdf PDF link annotation
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c103b93e9---56212736753.pdfIn PDF document text
    • http://lachambredechos.com/userfiles/file/poturumafalatodaz.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/lifezomuruvojeladeni.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/813671484.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/wogis.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/fibekajamivometufudazu.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302e5306233---lipedivuwavomilatuto.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607757571417f---79420011826.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/30543130737.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d85033ead6---17383493357.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/6521907001.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/46753985277.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/22110224542.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/64bfc827f27df39a129f2409135de182/remegafatufikosezu.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/tuxubufu.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/94388339029.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/nagibelelir.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/wexoromo.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed547552d0---70170450897.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/ea65c426b31322d42198d3e9955b02ae/40200747682.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/76772970676.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/xexoziju.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/38678187277.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bcabb22e423---farivazaporusegerozox.pdfIn PDF document text
    • http://thucancakoihikari.com/luutru/files/wumesimamedifixaw.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_off0000bd8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59D 15652 bytes
SHA-256: 26f20328bf5c103145be41bae463baff4f26ebb1e810986df84a302d5949c236
font_02_sfnt_off0000fdd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD2 10620 bytes
SHA-256: 68333b152b943137b214d7d79a0d0e5078046cd464dc6bcec23ea329e9c96587

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