Malicious PDF — malware analysis report

Static analysis result for SHA-256 00b1a91574caaa5b…

MALICIOUS

PDF

86.5 KB Created: 2021-09-07 11:30:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 32e6d6cb0dd5e60542a95e5d333b02a2 SHA-1: 1b93acb93b78104d818a06f2d133fe68f1d92f6c SHA-256: 00b1a91574caaa5bdbd711e910b5558e002ef495f757e7976ec9c5eb6432df99
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware distribution sites. The presence of multiple distinct hosts and the use of disposable hosting reinforce the link farm nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b51c5766b---vofakogur.pdf In PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b23684859cf---tuxanozusomegog.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/66841807687.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/kapuwobokojigarubotujo.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5092fa4c7b---45265306017.pdfIn PDF document text
    • http://amdind.com/userfiles/file/sizelikagitufobazozap.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/fusanamobagesoleluf.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/djvojch9f5lu847uvgfas66ne7/dakuzotelovafi.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/pogegig.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/16639645752.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/13283107353.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1611f8085970bd---94821652728.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/dbd08b6e79dc8a6070bc5c871830c639/jewizegaxupagajatumeza.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f113c0d9f---86712931268.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/827f05fa1724d4c3bb8c1983cc97beec/84432002243.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/79491802575.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/batuwusigexadokuka.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/0ded29b51640feb63b3a53642fb1aa4c/46807557026.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/vlge76n0cja0k27vbp3nie6nvj/levudatofaw.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa2a00afac---lanoseweniwenonibiberamex.pdfIn PDF document text
    • http://ibnuaffan.com/ckfinder/userfiles/files/vaxirivoxatusakojolu.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/latobusujiberarosam.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/lujimomosepixata.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16081f6963dac4---vavelovujudonitixusajul.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/64556527572.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/eb2c7283be153d22954a2107b39f1cb2/66851032495.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=tabela+dinamica+excel+2013+passo+a+passo+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_off0000ea5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5F 11252 bytes
SHA-256: 7fc724dd99fd092c1a85ef896db002a60844ad2bf5671de933efffec6137545d
font_01_sfnt_off00010497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10497 18388 bytes
SHA-256: a6e2e7c5cc2e71a200805a8ed07347b74b95e5bc0154fcee28720028c1e8e628
font_02_sfnt_off00013460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13460 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1