Malicious PDF — malware analysis report

Static analysis result for SHA-256 23948b5415ed2f9c…

MALICIOUS

PDF

70.7 KB Created: 2021-05-23 12:06:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: afc7e19cdf9afc84854c83bb26c07fdd SHA-1: 46fc88de91c222c1097edd3197a8ebb17e3ebcea SHA-256: 23948b5415ed2f9c33ea44a67b77c17062c4e86bd556516b3b260f8c033eef95
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, contains metadata related to its creation, and the presence of numerous PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a strong focus on external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://walkandsmile.com/userfiles/file/5853649201.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/179a46b234db3449473f41c6e4eb7d30/37135841530.pdf
    • http://k-yoga.org/file_upload/spaw_upload/file/20210516123626.pdf
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/f5360e5d4756f265e02390997dfd41e7/72729856228.pdf
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/7af7312cc25ea113d127c70fdc1b2a59/vodezibesa.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb38325b27---77751578170.pdf
    • http://intergeored.com/upload/File/17718855255.pdf
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/5843c47a20d6d8b23d46a5ecc617d9d7/31632100639.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/a40b6170dd758b355629481166d23ebd/tokuzarulutitekagoj.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609059c31d819---98003527386.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/seq1cqeh5qs2gf2vb4mjfjo3el/tanaxojusofigopefabitaka.pdf
    • https://ajwatravel.com/wheelmarine/userfiles/file/wedexoruzuvugari.pdf
    • http://fixafilm.se/userfiles/file/98210499131.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/eb87526b568ff798b054c2fdc34ff8b0/99875342457.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=amalgamation+of+firms+problems+and+solutions
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6ff.bin
648853cba3ee36aefd059645f9682b63c7cacf0b2fa4ae2cf09b1996460b94f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FF 5492 bytes
font_01_sfnt_off0000e98a.bin
b6868e91f8e735353fe94fd4edee712a63d490bef04182b3d7860b26fc664be2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE98A 10764 bytes

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