Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9cac6bbdd387e04…

MALICIOUS

PDF

75.1 KB Created: 2021-06-21 00:18:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2707568da3ba912c64ec27952fd04ee8 SHA-1: 7d6b2380de6aca116e263a819e197aeaf3e34071 SHA-256: d9cac6bbdd387e04e68979bdeef9b05bb75a990165e12b13c35a995bb8faef7f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed for malicious purposes. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded links and the detection results point towards a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seanmore.com/userData/board/file/wobiwuxuwagorobadozileza.pdf
    • https://amrapalispot.com/userfiles/file/48166358941.pdf
    • http://lacasedescaraibes.fr/file/38015935938.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/7k3vuotlub3bua6t1kvo6iqunm/gunuketetoza.pdf
    • http://short-story.ru/upload/file/42815391932.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/68321969ab833e35aa2ccffaa2f88de9/biwebikamib.pdf
    • http://www.zywawiara.pl/pliki/81514460564.pdf
    • http://ctkupavna.ru/upload/file/79355021671.pdf
    • http://uleshuzatshop.hu/files/file/jilopudimo.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/f176bd486e986dad113d4a5b001b2d55/23456674044.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16082ec2a8022a---xezowi.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f62bdebc2---xabugudajanagupemoner.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2f7c80b5b---pifit.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/0b9d3e7c0f3a62e931816ea8b11c881c/87364065914.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/df2aec85f8a51caa941825bb08ffbc08/nadububibojabubonakon.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd035e37a6---70118183587.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=random+generator+drawing+ideas
    • 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_off0000e823.bin
5c0a154c75ccefd2aaec58c3474a03ad3189405296fb1ea1ba3edb92d8fd1545		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE823 5212 bytes
font_01_sfnt_off0000f9e0.bin
0e548a0fa13ed9e1d1215ef593eea1699c35edd5684f2211321631ab51952f11		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E0 11304 bytes

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