Malicious PDF — malware analysis report

Static analysis result for SHA-256 d584088627a2a151…

MALICIOUS

PDF

81.3 KB Created: 2021-09-03 19:45:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: b2c213a15b3b94853db1d02173a32029 SHA-1: a6ba5bd0aafe6a4c67a32f5853825b3d2084d8fe SHA-256: d584088627a2a1513ae6b979a7450b99bd72850e7ba4c9a1833df385fef3fde9
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inwebjor.ru/uplcv?utm_term=clinical+pharmacy+pdf+book+free+download PDF link annotation
    • http://happyhanool.com/ckupload/files/6573310788.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/80107927244.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/77423819221.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/xoxazipatibexuvemogu.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a253b79429---wopex.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102fe9ab35e5---poxadaseluwuwinazonigojil.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ac1359f2db---xesubiju.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7e11dc576b25538fa343e0efb99c69e6/pisiponisekavu.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/1m7c47si4vi566vmpemdd7ecg0/tadixozugijerezo.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b10b186f243---64713620745.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bf98a103cac---96123826837.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/49746172110.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/79950345994.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/54078724244.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b3dc7935fb281e45fcd2ecceff0d1484/karixalipuvakogewuzupi.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/de819837b1980a1b8f56f12da5858a43/50103801523.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/giduvawavazipulize.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/golezimisizugamumolu.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/tefejilufav.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/wizevexenafimareb.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/nunuvabamib.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/luxabol.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_off0000d900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD900 17364 bytes
SHA-256: b09145580746e297826c0db7339bdcd06feac4d50d4ccfad6f441d02861cbc26
font_01_sfnt_off00010659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10659 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E70 11084 bytes
SHA-256: 654bbe90ee088166ac5203a2a622ba985401f5fab9680c8ce33b950348677720

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