Malicious PDF — malware analysis report

Static analysis result for SHA-256 730d6780f14b197c…

MALICIOUS

PDF

87.1 KB Created: 2021-09-15 10:21:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b7ab37469d31d4ccd2619ac128c8907d SHA-1: 830722e990ca40b4a30a860a555613936e5a2cc4 SHA-256: 730d6780f14b197cec469cd0e06f08697101f58a9d247fd3647a17dff78435a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the PDF structure strongly suggest it's a malicious document, likely intended to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://queure.ru/uplcv?utm_term=c+sharp+android+app PDF link annotation
    • http://hilimall.ae/uploads/files/73879645261.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/c53fc58a0a6587e684ce6e51f659aa7c/mejajonojofuvesakepisa.pdfIn PDF document text
    • http://www.polni.si/Images/files/28423416526.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/newakubinevuxesul.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/kedusosozaxusonumufepa.pdfIn PDF document text
    • http://snuhonors.com/userfiles/file/51535107712.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/65585082333.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/lafuvibivopagivu.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/67235007244.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/fojusitixufomuwer.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/ae105a9deaa991fc64e28c40445a2e65/dadatimajobenedibewu.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/74710795374.pdfIn PDF document text
    • http://nwatchonline.info/userfiles/file/vubikebelikatab.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/54500328328.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db6276cd5c---telavozizixu.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1614167d18a9a7---24181007885.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202109/file/vinabodibamaxo.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/24031108827.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/pofosutowozowed.pdfIn PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/92560378525.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/e448fc6c535c10ff2b121ed649df4402/sowalironusike.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_off0000f02c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10843 10244 bytes
SHA-256: 94cccc1668107600585c36f0057d4ca5f6806e07a37c49d4977bd06f45c1ebd7
font_02_sfnt_off00011f1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1F 18364 bytes
SHA-256: 0f758c69ce9a2c7df5b6babc9c895edc53cdfaa4cf5ece102b87bc983e5cba6f