Malicious PDF — malware analysis report

Static analysis result for SHA-256 52002eb6c3051fec…

MALICIOUS

PDF

84.0 KB Created: 2021-08-15 13:04:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 64fda0ee99ffe57288609b2a22442aa9 SHA-1: bf11b2b735a659c836d1ae098b84f52e5cde1cf5 SHA-256: 52002eb6c3051fecc58c799ea2166156664807019f6cdadc7595df14b4ac5b61
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 high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farms indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/94f41b703585873c00dd5a239737aa4b/6444864310.pdf In PDF document text
    • http://csc-021.com/userfiles/file/20210709125806_moll6z.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2dd2ec16e5---gurixuvev.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/61a34b009a2048995ca983d0a36fe427/wudatuvuv.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a730a10fb---36472619759.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/kupefonilamova.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/tcdqj781hka206j06mee33qe07/77324626374.pdfIn PDF document text
    • http://twilaw.com/files/files/92811130629.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/xebururufoxugabu.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/39148450624.pdfIn PDF document text
    • http://teechart.com/uploads/images/files/zutebozojiduloz.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/63941913959.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/95506980498.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/17694189454.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85040933150.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/95229087371.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/dc7adb8f72c2873908611493e2a1d476/69431521463.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/wabofotisazi.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/guropikunureboviluka.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/98498785976.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16070255ad6846---sojerijelakomorepapapo.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/fujuvejudoxapuwu.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210710_6AC54D086A9E3369.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/32171763359.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+reset+a+nexia+thermostatPDF 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_off0000e561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE561 10504 bytes
SHA-256: 72d4846bcd15593d4f18637518d8737ab87fec51063586f80a97e52b4a61495d
font_01_sfnt_off0000fd25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD25 17252 bytes
SHA-256: b85db73dc343613c3ab3672bf26fd79b353930198bf4adfcb99cf7c13d763c96
font_02_sfnt_off00012a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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