Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3676b7b53ef4ccd…

MALICIOUS

PDF

89.2 KB Created: 2021-10-07 22:47:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f44a918ac45bb8d55828bb9d806b908c SHA-1: 9589c6d71af3ebca906627ba7598dc252a5d5016 SHA-256: d3676b7b53ef4ccd7134e09843f693ea3d9eeabca5ebec1e7ca7e55f4ea9dc9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous URLs hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of many unknown URLs and the use of compromised CMS uploads strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615621c96b975---kirajizonudesunifoneniti.pdf In PDF document text
    • http://www.greenfield-sustainability.com/images/files/91560030796.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/60141308221.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/89017812308.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/51371136185.pdfIn PDF document text
    • http://www.toptehnik.si/images/jibipiwaguniwutato.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3dac908ff---31735808960.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/94519358022.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/57564949746.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20211001_044F58AAE9899D41.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/97971403467.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/depanubewaguzoji.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/xebodikodilumekok.pdfIn PDF document text
    • https://citronel.com/userfiles/files/guvodefetexefezoraxow.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1615d813c8b672---74388103322.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/53572345502.pdfIn PDF document text
    • http://decorstore.eu/upload/file/zivobezax.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vawiteza.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/wevipepiz.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210930210401600.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/cb6fc68f289bfe9b53fb5318771e1cbc/wedagolepokijigum.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/visojonomigupuwokopekafu.pdfIn PDF document text
    • http://aktien-analyse.de/images/File/95283218963.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/mexepowisidu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=points+lines+and+planes+maze+answer+keyPDF link annotation
    • 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_off0000eb8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8C 22152 bytes
SHA-256: c2a3095c719e368cd6df37788634cd248c99025a015caa343b8a3051f0433171
font_01_sfnt_off00012570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12570 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D87 10904 bytes
SHA-256: 2fb21ee2fedc24d4f4b8670543ff171d7278c4b8785adac122b97bf9f979ad4e

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