Malicious PDF — malware analysis report

Static analysis result for SHA-256 0411b4d9234bcd88…

MALICIOUS

PDF

80.2 KB Created: 2021-06-28 02:50:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c33e43a0894fdcaa7534c938685c7e91 SHA-1: 7a03050904fa8a33137254110b2c7f48c3022d4d SHA-256: 0411b4d9234bcd889e650a3d92f17360a098f5d2b3d73b4d816695dc1ba02eda
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It functions as a link farm, distributing numerous URLs, some hosted on compromised WordPress sites, likely to lead users to malicious content or phishing pages. The presence of external URIs and link farms suggests an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=funny+logical+questions+and+answers+in+telugu PDF link annotation
    • http://sitoad.com/bbqjoekey/files/202106280613103793.pdfIn PDF document text
    • http://www.trafikyaren.com/wp-content/plugins/super-forms/uploads/php/files/vl6o5cseetlanapsdrhpc2pi23/51610051986.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/37398073237.pdfIn PDF document text
    • http://tomnhenryanderson.com/clients/8/8a/8a1068334c160bb49438aafe8043afff/File/dozutozoza.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607113c493ae0---rovudozugaxiburipowoja.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/bokupubosifegaf.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/cfbc609849a5832cc09607e09f7bc7dc/sipopenevodivutipazaw.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/2d9329c1c41e0dd415007f019a173983/15661445219.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16094533f3da1e---tiwizakajosad.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/82045004578.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/dijixajisakipamop.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/18706667900.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a85752587---15828232376.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/fanemazetixozimasotelufo.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9cde6a3c5---57481299737.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e21fbed78---xemelobufekopise.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f05f80d49a---solozazofugosivasaxiwa.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/merepinabavogem.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c70d745ec0e---50865236385.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/kbt5qr1r4p8ts1vbjh2458vqn2/39808070111.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/u8jngche7eiap1sov649fd0fp1/bibedo.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/1b3fb84f159a8f234b097a890a7a41d8/gififofo.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ab399a2f279---nunevovisavavegejudifivek.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/57580628469.pdfIn PDF document text
    • http://dollreunion2020.com/clients/4/43/4392dc7a9e9236654a628da0af121bbb/File/85059574512.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_off0000d402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD402 10968 bytes
SHA-256: 99ce7f822a41027f849fec141519749cd61ccc3a2d7425fddd817464cb029cb4
font_01_sfnt_off0000ed2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2D 17036 bytes
SHA-256: 48f12c7417cc4ed98445a5422d8312ec46debaf2aebabb756bea9fd1279c8257
font_02_sfnt_off0001198b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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