Malicious PDF — malware analysis report

Static analysis result for SHA-256 de81e7e79ddead51…

MALICIOUS

PDF

74.7 KB Created: 2021-09-28 06:35:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0132885d713d6c0546acc697f55ad9e8 SHA-1: 5ca30a2feac13546083e067391582bf4f0d7b061 SHA-256: de81e7e79ddead518fb15d63b5dc4495c9d0db6cb9dada9e70e3ca0047c5aae2
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm and a potential phishing or trojan delivery mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs, particularly those hosted on compromised CMS uploads and disposable domains, are suspicious and likely lead to further malicious content or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/161467b3aca043---13254765453.pdf
    • http://stalmont.eu/userfiles/file/53878712179.pdf
    • https://canevastoilestjean.com/upload/editor/file/bolopamatolazejaxijevu.pdf
    • http://maekalocal.com/Maeka/UserFiles/File/dekorurugupibofo.pdf
    • https://dollarplus98.com/images/upload/files/15662331168.pdf
    • http://dreamwith.gni.kr/ckupload/files/zitojuk.pdf
    • https://ihotel2b.com/upfiles/editor/files/39050521185.pdf
    • http://xingyeknitting.com/userfiles/files/katesurawelenivaxiwukefa.pdf
    • http://eortak.com/img/fck_temp/file/16175974976.pdf
    • https://hum639hb2-hh38.com/contents/files/mojopuke.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146187c4ff57---lonof.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416cef38484---xiwoditilakuwiribapimug.pdf
    • http://ping-property.com/user_img/files/nojuvuguj.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613e30446f7f2---42344166991.pdf
    • http://tamker.hu/userfiles/file/xigixalegiwejed.pdf
    • http://www.tecnologycenter.com/admin/uploaded/fck/file/52408982317.pdf
    • http://erfansari.ir/ckeditor/files/files/11121545007.pdf
    • http://yejida.com/userfiles/file/68897035800.pdf
    • http://na3.it/misc/file/binolaponotowotifa.pdf
    • http://www.prctech-th.com/ckfinder/userfiles/files/6459710296.pdf
    • http://signauction.net/userfiles/file/nixoba.pdf
    • https://nezamirekhaseafoods.com/userfiles/file/susifuwomivamopuve.pdf
    • http://marienoellebermond.com/img/uploaded/file/38917509134.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=finding+dory+full+movie+download
    • 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_off0000bc7b.bin
ee9c1ce4903b0eeb6b0d44a4f9669defc1ea67d08fc565fe803f3d9080f903d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC7B 10776 bytes
font_01_sfnt_off0000d510.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD510 16792 bytes
font_02_sfnt_off0000ed22.bin
75ebe49ba39277f3191d3bcad8384c526bae3d26b0cc6415f4049a48b49b8438		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED22 18768 bytes

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