Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a8055534155361f…

MALICIOUS

PDF

94.2 KB Created: 2021-06-28 03:32:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 34c31b6c266d9abb440b5897d479744e SHA-1: 3a0bfcfaf8bc2a0c5c11fb8d9dfcd8c6ec838db6 SHA-256: 0a8055534155361f12a62832098f4fe04e1e2a19c0f19a7695c6f6c92dace05f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to numerous PDF files hosted on compromised websites. This suggests the document is designed to redirect users to malicious content, likely for phishing or to download further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

Heuristics 7

  • 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.
  • 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://vydavatelstvoklett.sk/userfiles/file/19228200513.pdf
    • http://anhuizhkj.com/upload_fck/file/2021-5-16/20210516110747837075.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/0fb7b03f85dd89c236aa490c0d111a4f/52477424792.pdf
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/turukutofo.pdf
    • http://glotecgh.com/upload/editor/file/xutavi.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/ddfa12f133f9f4fbe351615a4a9c483a/buvudedejinaxas.pdf
    • http://a-swiss.com/upload/userfiles/file/dixasiwekurifozelupun.pdf
    • https://birgatour.mn/js/ckfinder/userfiles/files/48673209942.pdf
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070784e8ccc6---sedikuxuwi.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d387a47fcb---zerevet.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec69f6d31a---pupibuxilirisebedusaxadi.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082241c1ac0e---xowufefibiw.pdf
    • http://konyaozgunmobilya.com/userfiles/file/debema.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d276634b4b---rikulatowukilotapa.pdf
    • http://hanarotalk.com/userfiles/file///59204336078.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f236665ba7---tawezagelep.pdf
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/cce8971566717ee3211ae39f414954f1/90674941816.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/b7ce915d63780e4b8566c94b67e96c67/jolipokukonulifaloxemij.pdf
    • https://bluza-shop.ru/content/File/mudigowajoteme.pdf
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/78919707975.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c719f486e32---4847447631.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d90fa5bed38---matorupufa.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/681f39eedd9b36027b6d27be4569a9b5/jogodujodixemotamakili.pdf
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/7d2e65092685780475c97c1150af3fd4/wuzudepufamatijelonaride.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607b325aeb6ce---45357348736.pdf
    • http://malbreil.com/userfiles/file/busumas.pdf
    • http://cnmrobotics.com/files/files/dopitaniporizavunu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=point+of+view+translate
    • 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_off0000e913.bin
6ac99476d5172fa578092988a613b133750814b11331df55a44e39cbd228f3c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE913 23308 bytes
font_01_sfnt_off00012403.bin
1cda6fa0de640ad1819d82cd39834e11bb64244bad7a468e5d34f73a027ccfa4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12403 10360 bytes
font_02_sfnt_off00013b99.bin
23cae91bf6cb8a2d385b66c14110db1f1ae7210e3668a6c35474e5d79ff748e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B99 16676 bytes
font_03_sfnt_off000152ea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x152EA 16792 bytes

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