Malicious PDF — malware analysis report

Static analysis result for SHA-256 d791026a0140865b…

MALICIOUS

PDF

91.8 KB Created: 2021-07-22 00:32:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b711d951f227d95f8c8719e94dd6e27b SHA-1: dd9547b9bc826c345b63d8241eec97d5c68e2bef SHA-256: d791026a0140865b5a26f2bcc598edc4f227f6fd89f36fa3d3a17572d6ba5f02
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads, suggesting an attempt to distribute further malicious content or phish users. The primary attack pattern involves luring users through a malicious attachment to a site that then redirects them to other potentially harmful locations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9c5554b76---setometininugugewurix.pdf In PDF document text
    • https://regiefranchet.fr/userfiles/files/77472449964.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/nobopofekidufebimivuvem.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/2vof4fnp7vpg4sae7b7247osjo/tubidakikulimegafaxagika.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/mirevufubalexomokukiro.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/fichiers/87627647813.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/d0142fbe4ff7850b92850ac516fc2260/tijexidizolokas.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/56699204943.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867ce87860c---pedaseg.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/43736895057.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/moruwotufuvagom.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c882a976113---95809738798.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/senezujep.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c647b34871e---3966231796.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/65754132605.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c32ffd070e7---93323428965.pdfIn PDF document text
    • http://msamericapageant.com/clients/873634/File/73542857035.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/27108460029.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/fupuxu.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/67455064081.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/5k714brv7qtecockjsdaqlqq4s/kenusuwukufikala.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160989d9269d8b---80982811926.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/c90b9c4127f91da61cd7ecac30fa7e44/gimuze.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/7g92mjngu6cqi3a4isioudkrl5/45554055134.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=best+picture+2020+nomineesPDF 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_off0000fd22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11539 10724 bytes
SHA-256: f81a8c46e9e802efa54b76fc5aa0e2c573c31dd45ab26cf958389f89865fe6d6
font_02_sfnt_off00012deb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DEB 19400 bytes
SHA-256: 4a68480ad2192a6386ebc80fa0b899d66b50499b6da1743e8917139a87544d24