Malicious PDF — malware analysis report

Static analysis result for SHA-256 92bda8131c33278c…

MALICIOUS

PDF

70.3 KB Created: 2021-09-28 23:44:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ca679e17efc6b1070754cd15b8f61d3e SHA-1: 58a177286fe7dd2daa12902d3e1018a021d5a5b2 SHA-256: 92bda8131c33278c3d9287fa5a970e01e88adcf8ce89f225ab6662a7f1ec5aa1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that function as a link farm, directing users to external sites. Several of these URLs point to compromised WordPress upload storage, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://drafthe.ru/uplcv?utm_term=how+to+install+kodi+on+mag+254
    • http://toyotarent.kr/FileData/ckfinder/files/20210919_6DAA32231CD03DB9.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/tl5hrif622b5jvdlul3giuet5q/36400829853.pdf
    • https://tort-art.ru/userfiles/file/xenopilukatemufin.pdf
    • http://flyingkirin.com/uploadfiles/file/191349273705.pdf
    • https://institutdesante.org/userfiles/file/47977355704.pdf
    • http://narnivet.com/userfiles/files/95948610326.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614eb52fc0143---jakeze.pdf
    • https://lifo-sea.com/ckfinder/userfiles/files/tadugimep.pdf
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/bevewonip.pdf
    • https://asfus.net/virgsurv/userfiles/file/sawegemawonerafisid.pdf
    • http://renovfab-menuiserie.com/userfiles/file/64873155519.pdf
    • http://champaigncursillo.com/userfiles/file/tefatesunidikedomabu.pdf
    • http://xinchenfast.com/upload/file/ferex.pdf
    • http://mudrkanuch.sk/editor_uploads/system/files/xumadogezivalukujukemug.pdf
    • https://sikahaiphong.com/images/news/files/genosonem.pdf
    • http://studiofranzoni.eu/userfiles/files/xugowesituwisanegoso.pdf
    • http://gursakaryahukuk.com/images/file/95314560866.pdf
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/98742959907.pdf
    • http://danguykhoidoanhnghiephp.vn/Upload/files/13811633927.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fed2c0750e---64865617599.pdf
    • https://ceccarbotosani.ro/userfiles/file/23073150994.pdf
    • https://find-domain.lazy-online-shop.com/app/webroot/userfiles/files/mosituwenapodaveseweviz.pdf
    • http://aquaclub.hu/userfiles/file/lusilitewamifa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af74.bin
c56ed7f31f8a3b000bed8e9cb4ce5d77c877c6ae833807a82e4cadf704927017		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF74 16172 bytes
font_01_sfnt_off0000d8d3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D3 16792 bytes
font_02_sfnt_off0000f0ea.bin
bfb405bf7ad6e0e861b520dec843e0158149f697357ddf0fd442dd6319eb0d25		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EA 10860 bytes

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