Malicious PDF — malware analysis report

Static analysis result for SHA-256 68d486b800a598b4…

MALICIOUS

PDF

89.4 KB Created: 2021-09-03 02:26:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 4941878e3e339804a4ca5b23b37857e2 SHA-1: 84c86026a59ac56d62bcb5d6e830e7d56b134448 SHA-256: 68d486b800a598b41944bfa226f3b6cc97afc35a5487a406e2e90c90b0f6c873
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://archism.ru/uplcv?utm_term=casimir+effect+pdf PDF link annotation
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2ec43bec4---wurebamekojam.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5e29a05c5---71181187602.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/69247086557.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/31691631862.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021083112432883.pdfIn PDF document text
    • http://s-box.biz/upload/datoteke/72442301846.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4797ce40b---11593687539.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/wuzokerubutikepipuvagise.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/pulogozupebo.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160985efb61915---lozegoraruvu.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/darekugoxinikuruzuvatiji.pdfIn PDF document text
    • https://starbox.fr/img/files/govovenufejigadosatuzeb.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608562010dd15---76587571928.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/fc5956b9578517210e6978fea8350b99/16660927392.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762e3f5620c---tisitopidaterolasutagiwex.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c9821a68e---69724239288.pdfIn PDF document text
    • http://psychoterapia-przemysl.net/img/userfiles/file/mipazivavigipiv.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/f0b08a376d59441cba042f0028b74b74/rakebitubup.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0588046b16---82616229784.pdfIn PDF document text
    • https://geya99.com/ckfinder/userfiles/files/kesuvu.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0c17372b7---vafebojeti.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/62e17d7bcf285c24aa083c06c35425b6/sivufolavogofirujosok.pdfIn PDF document text
    • http://rayer.cn/d/files/vaxum.pdfIn PDF document text
    • http://camdohungdung.com/upload/files/7086401070.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/35c0e824e72b4919275424a92bfaeda0/tetowodanisubifit.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/zijiwefimaravanapunu.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/lomutavedoso.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_off0000f519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF519 10544 bytes
SHA-256: 8b6a44c32234e55e05cec9e6cd45c43f51859247d9a529e007e7054fb89deacf
font_01_sfnt_off00010d1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1D 19240 bytes
SHA-256: 6c5c956bd011677e74a223f8cc3af9dedaf698756a8912aecdf68a8db8a20e47
font_02_sfnt_off00013fb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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