Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b32aeb9bf0df502…

MALICIOUS

PDF

99.0 KB Created: 2021-09-04 16:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b0f182cfb4c40489f626d4d45c3a1971 SHA-1: 3991b651dd2d462da30fa464bcc842fa09668da5 SHA-256: 2b32aeb9bf0df502629365291bc28d8dfc602efe17a471bb20b420a46c22d393
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://krisoc.ru/uplcv?utm_term=piano+scale+book+pdf+download PDF link annotation
    • http://ural-resyrs.ru/data/file/mewuxumelezubedopururipew.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/gadosiwisirol.pdfIn PDF document text
    • https://xn--lenachatka-57b.pl/uploaded/file/bojoxagabaxasuwa.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/11988176273.pdfIn PDF document text
    • https://dietacud.eu/upload/file/95595441131.pdfIn PDF document text
    • http://arslanemlak.come/file/mojubuzizirusefijex.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/46508997b4aa98c98abbb37ed382002a/87419460945.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611bed6d70a42---pupatavomirapepepexu.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/xadori.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/bitifapikuxizeji.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/xisutowabitu.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/13978248959.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/ninavifijazuxasozimenotak.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/ca3ef23673697b917a17facbc5304763/49656706354.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160735c891cc5b---51155538535.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/44087194333.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/sevimexiner.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/1d4e0b82bd2ceee6cbf269d59b7740a8/pevaxojo.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/75684499015.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/10600230993.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/938b375da7362beda8917fccfe719ae6/fiwup.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/94380942333.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/41943196707.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_off00011a26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A26 10732 bytes
SHA-256: 20296287ed618393df3dad342a296475081bf51d0d4603ce9468da7a8819a68b
font_01_sfnt_off000132c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014ad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AD4 19520 bytes
SHA-256: c227ea647b25328d4c92042687add3f59b671656d05a6b922dc8954205e93c5b

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