Malicious PDF — malware analysis report

Static analysis result for SHA-256 66dbccd7d27f0682…

MALICIOUS

PDF

83.2 KB Created: 2021-09-01 05:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f965c55edac288fb7ccc67e238dffbb4 SHA-1: ac2316acac989e51ccb7d431167aa18d63709aae SHA-256: 66dbccd7d27f06823df2a5d7a4341933ba8e90bafe1caf9560049178c295ea12
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, directing users to numerous external URLs, several of which are hosted on compromised WordPress sites. The presence of these links suggests an attempt to lure users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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://wastran.ru/uplcv?utm_term=introduce+oxford+dictionary PDF link annotation
    • http://controldellaves.com/app/webroot/arxius/file/15895134434.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/80ad320e7a0bc7d2f2bd255e696350a3/zajedumasigozajulekitugap.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/41829986539.pdfIn PDF document text
    • http://scan3dsaigon.com/upload/files/99032836412.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/r1fmuck69mtgt1kltfpceql3tk/kogigoxaxatipisogawirok.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c29d40bd086---63728889812.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/000eb0929b2b75cc845352d5b8f72a3c/81180602657.pdfIn PDF document text
    • https://yuss.it/file/jawemuxuzibivevuw.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/3rpugs1oe1oqv5rirr06n81rme/velosorimuxodotomesak.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9b3b48c70---49926528722.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/xikabokesivezerewurav.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/wisenilulixojik.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/goxemavivebefunexizosu.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608ead18595c1---duberatirofibe.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/611fd12347709.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/xudilixuraramoxuvo.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/3d448e46e739d376ec5eac2f2e58bb2b/wadimodobinerasozo.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/belonijew.pdfIn PDF document text
    • https://monyetmesum.com/contents//files/gujababezijukazofi.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/36302785158.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1608b811f69e11---40394475022.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/fakozub.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/kiwetowizabuva.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/spobanb89jhfnr8dfijag2u0ru/vubunutojijabule.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_off0000dcf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF6 10524 bytes
SHA-256: 7073b4d1f463d47648eb7098d90dd3124ba57573fbc0fb83abfd85312d235946
font_01_sfnt_off0000f51a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51A 18812 bytes
SHA-256: f7c624350679e189e1ca0583143420a0cc12aa2e355f47dcd358efd608b73182
font_02_sfnt_off000125d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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