Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b8b39c6285c6a00…

MALICIOUS

PDF

85.7 KB Created: 2021-08-03 09:17:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c457808f45676f657f890090c265d48e SHA-1: 66bf00bea44dd4738b0988576f64c3d44aa826c0 SHA-256: 9b8b39c6285c6a0022642edb217f4e0a37f7bf68f6b15da1dbfcc48e85d83285
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating it is likely a phishing or malware delivery attempt. The file contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the overall structure strongly suggest an attempt to exploit users by directing them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://fujiya-la.com/uploads/files/77713053158.pdf In PDF document text
    • http://diversecityuk.com/userfiles/file/kiralerezadafu.pdfIn PDF document text
    • https://vieiras.pt/imagensprodutos/file/zulibatizu.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/19574342552.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/8fb1c180e542ff1770e056b573ed9c44/63886761550.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/turad.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/guvonemer.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/fdebd30caa82f5b39c14200801896e19/bupudorazabopotad.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/e05c6eb255c9e00cf8106ff23805d8a0/jaxubaxidokegasiwa.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/db8dc6f70a3208d5b2cbf02175dca7ce/96391735066.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607aaf2349ede---novejudik.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/78597157266.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1607e601eb993b---torekipubugavikisa.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/96889793692.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/pativisanogawekidigufebej.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/5e43148ec611155d7133e05bd526b27a/42209045153.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/dfaea7364c99b16679442f042f3df4b8/57591898254.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/jmsmm0f3hc4i302om0pa1iegg4/tikazekunejulojepiwoxa.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160e7bfcd0b885---2383094357.pdfIn PDF document text
    • http://serenetransformation.com/clients/870552/File/49043063915.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/r7pckgclnq6156ita9343im16t/99686754402.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/7f5558kkaksk64vrn9io4eblkj/xomazipagafer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=business+for+the+21st+century+skinner+pdf+downloadPDF 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_off0000e82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82D 11332 bytes
SHA-256: 1fd5a2521de7d3a36126cc89fdea1aba112c57e1dbab41defd00ea41175a19c2
font_01_sfnt_off00010308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10308 16896 bytes
SHA-256: 1ed0a6ca4417ba8e26ca53421140ae06a6e2fb070e3a7494e5a7bda6a562e0b3
font_02_sfnt_off00012f53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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