Malicious PDF — malware analysis report

Static analysis result for SHA-256 d47ec87e47484b0f…

MALICIOUS

PDF

88.8 KB Created: 2021-09-05 22:05:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 15ddac72d99605b675e74200eb4a0ab9 SHA-1: 59a16e5ba6a93b837b6a408589b8d7413750a34a SHA-256: d47ec87e47484b0f2e93ce4f359a5d8cccc3636f13faba25b25af0348f140327
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, hosting numerous links to other PDFs, many of which are hosted on compromised WordPress sites. The presence of embedded URLs and the nature of the link farm suggest an attempt to distribute malicious content or phish users. No scripts were extracted, but the overall structure and URL patterns indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf237727eb---lubuwanexenivan.pdf In PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/59335845201.pdfIn PDF document text
    • http://lynhuagiasi.com/Images_upload/files/39002343930.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b747432585c---jesibigewexuvaroxugeke.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/cd40da1b8d64a155f865e9b2bceb3f28/lifel.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6326a9a645c2bb8086a96c2134584cec/83275292442.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607da19aa07fa---13995802789.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/iongfesbm4jaiviidvv722eveg/nusufiregudadagutolatuxo.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/99964716063.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/pobewefilodusiwelisa.pdfIn PDF document text
    • http://jonmechina.com/ckupload/files/tawukufofov.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/92869729203.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210831_852ABE1D3769CAFA.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/68f323a324554d9e791952237349752b/42507760034.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/fenezabejowedawix.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/jaraf.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/bfa5b687764fec86143749b0faccec12/80264189421.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/gogumi.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ce0e549422d---30445522928.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/velajapise.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16092118a82568---30042791505.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/xewuwarokazusaribatarugo.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/41204326162.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fee655513bf---49969699641.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/jupewosevajesolusalixutoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=front+end+developer+interview+questions+pdfPDF 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_off0000e3c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C6 17488 bytes
SHA-256: 3f27d93c40d0c83cb647b6c24d8dedc4e09f1d9cff63cfca7ca33500448b5163
font_01_sfnt_off000110e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FA 17116 bytes
SHA-256: 48d8762852620bfe3ba4e2b69ab3e732be894809d6fafba25327dd808f5258a1

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