Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb655cbfa53130ef…

MALICIOUS

PDF

88.4 KB Created: 2021-09-10 08:01:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f21fe8115c28d6d93480514c1d77c9ea SHA-1: e2dce565170ca5d87c8b274162227582da7bd530 SHA-256: bb655cbfa53130efcf577473a2beadeac656492689439dceb12b6d2c50823efa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm, with numerous URLs pointing to other PDF files hosted on various domains, some of which appear to be compromised CMS uploads. The primary attack pattern involves directing users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://huntic.ru/uplcv?utm_term=ielts+speaking+from+the+past+exams+pdf
    • http://babyindex.nl/images/uploads/puduxudikenedazorofivepo.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613941aef0f51---xuguriw.pdf
    • http://csp.hu/editor_up/sebaso.pdf
    • http://wohntraumgmbh.at/38004332430.pdf
    • http://palazzodiaz.com/userfiles/files/63687535890.pdf
    • http://vagtteam.com/userfiles/Files/banazodenuma.pdf
    • https://vildmarksjagt.dk/userfiles/file/56642453747.pdf
    • http://maremio.ru/admin/ckfinder/userfiles/files/dagarega.pdf
    • http://mocphatreal.com/assets/images/ckfinder/files/31458706094.pdf
    • https://cmottaviproductive.it/uploads/file/semibobefug.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/8248d7b0982def87352aa4c9ddd09737/41529859061.pdf
    • http://beccaro.it/userfiles/files/vinuweditimubajedesel.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133b13248ab4---luxiwi.pdf
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/kavatakas.pdf
    • https://seedomoretravel.com/files/files/gapeb.pdf
    • https://avukatwebsitesi.kocgrafik.net/upload/files/josijapigojomiram.pdf
    • http://okuninka-biale.pl/userfiles/file/tubikelatele.pdf
    • http://maybomnuocdanang.com/uploads/image/files/43498513785.pdf
    • http://domoticasociale.it/immaginiNewsletter/file/bawadulosegizabiluzivud.pdf
    • http://mkconline.com/landmark/ckfinder/userfiles/files/bosebebupezapuxefuf.pdf
    • https://icon-studios.com/userfiles/file/60176189840.pdf
    • http://galettedesrois.eu/userfiles/file/41115641873.pdf
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/sikowuwiwepolarizabulub.pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd45.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD45 16792 bytes
font_01_sfnt_off0000f556.bin
0e4cde3d5bdd5452960de995a4807c8da4ec665155a9812e2f8e54e6c49b7878		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF556 16448 bytes
font_02_sfnt_off00010c2b.bin
2cb38babf1a17635884e7ded7cb8964b8771cb967edbb04e992f5c8bd35d0313		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2B 17884 bytes
font_03_sfnt_off00013a86.bin
9fe4bc5b5fbcacf295ca04bf095b07ae40907deb480f86dd11a7bd12e644ac8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A86 11092 bytes

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