Malicious PDF — malware analysis report

Static analysis result for SHA-256 db568009cba9cc58…

MALICIOUS

PDF

78.0 KB Created: 2021-09-16 21:44:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1a2aa97cb54be9d464dae6fc222d1b49 SHA-1: d2d90840cddffb2ca8975fd29e59eeb3666041b9 SHA-256: db568009cba9cc58f215211bc88feec6b8d9d6564ffa524e0ae7940829282b56
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to compromised WordPress sites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for executing malicious code or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=antivirus+per+tablet+android+gratis PDF link annotation
    • http://ntvietnga.com/upload/files/69509767117.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/gibinuza.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/33428089795.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/d0fvg2jp7qrjs7nvlvlnlq3np5/kowirewewe.pdfIn PDF document text
    • http://storemisr.com/uploads/files/2607388147.pdfIn PDF document text
    • https://toocapen.com/files/zewasaz.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/52040229249.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/161362c093dd89---6841068192.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/66717675390.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/defokilavumazig.pdfIn PDF document text
    • http://dsfly.com/uploads/files/27316169352.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/82870430864.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369381429b3---74344963153.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/visipodibadoz.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/56596907388.pdfIn PDF document text
    • http://popmetre.com/news/files/37832435154.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/jenigina.pdfIn PDF document text
    • http://unseretochter.ch/images/file/51973177235.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/tupulofa.pdfIn PDF document text
    • http://grabnerestriche.at/wefututejipaguzajadoven.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/rarupo.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/22572994746.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_off0000cec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC0 10856 bytes
SHA-256: f41429c538d8a433161fa4855b77386b7a64b59136756b01df01752563d552c1
font_01_sfnt_off0000e788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE788 16520 bytes
SHA-256: ef278ff52fe156068c254bcca4cb0b1a8f01f240107992e8689882ec5faac9d0
font_02_sfnt_off0001122a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1