Malicious PDF — malware analysis report

Static analysis result for SHA-256 286ae956ec026174…

MALICIOUS

PDF

87.0 KB Created: 2021-09-16 15:23:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 080d33b52c9310fabc8540a31b426b66 SHA-1: 6103556e438c0b497f2dd6ade8eb7cfaa423a344 SHA-256: 286ae956ec0261744fd0d56a2cd65799dddd106177c756f76a994519edf39b77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics confirms this redirection behavior. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://ketchas.ru/uplcv?utm_term=the+big+sleep+book+pdf PDF link annotation
    • https://dnm.tw/uploads/files/202109080935339778.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/gilegajiwifawiveso.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/39607728810.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/65374333761.pdfIn PDF document text
    • http://euro-ex.net/images/blog/file/76760382017.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613882a5040f7---vogewakukajoveki.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/zokuwuwi.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/guvir.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/8a773cbb2949f6100ad404dce0fa709b/40142614378.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/sebigezemazuzu.pdfIn PDF document text
    • https://ecoquimica.cl/dinamicos/uploads/file/wufule.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/5e47fadc78da70d8b97c072358b55fb2/14081891217.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/dotegoj.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/a6968ea4b029145a962f63078a6799d9/60092409483.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e27cc5c76---63153605404.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/zidegosiruxukofumemo.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/44538544729.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/ce6807431dd3b8c0ec251d0b46e2a514/sudijopugesunukabel.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/80126645949.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16134afc4d9ab1---52536511385.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/65537899646.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/67662819936.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_off0000ede7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F9 18788 bytes
SHA-256: 4342a4e0dc3dac14a294bf17f3fec1b9f1b2372cfad53a569e3c092035f431ca
font_02_sfnt_off00013720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13720 10508 bytes
SHA-256: 8754a0a934ed3480104caaee9cb2485be089f109ae90cb45be7e3e9e97afbc91

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