Malicious PDF — malware analysis report

Static analysis result for SHA-256 f57b78928fc3d9f5…

MALICIOUS

PDF

83.7 KB Created: 2021-06-25 23:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 88d17d469f6d45d44f1e54b292b5129b SHA-1: 2ad2ffdf32947733fd3da42f68f138801068bf14 SHA-256: f57b78928fc3d9f51787aaff84a23fdb70a03aea4373b301af4075cc547df438
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the URLs and the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://smidgel.ru/uplcv?utm_term=slope+intercept+with+two+points PDF link annotation
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/1pijs8ufqg9p9vqp0hijob7mu2/56785700527.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/66927755169.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/kajazafezuvoded.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/62a9fb7930107716e5cf942897fdd142/nuboson.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160af4e2b005ab---livenisaniwufoxevolesip.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/xitufodif.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbf22c95db---kafukatagabiwokegudawiro.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/jopetisotivapi.pdfIn PDF document text
    • http://mosjob.ru/images/file/92342001225.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/2e61a777b6e844da0d0a5ad5851a0f67/97272496663.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/kulejidubojepuka.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ca826557a---53791976940.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8fd9cece1---72587586107.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/wezil.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cbcdaa25a84---37016275504.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/89992464727.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d1fecc8cb---toluraz.pdfIn PDF document text
    • http://tktravel.shop/FileData/ckfinder/files/20210608_DBC57FDA3314BBF0.pdfIn PDF document text
    • http://kusadasidentalclinic.com/img/userfiles/files/xozisa.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16098416f38a2d---jofarawepitugopanokoluxu.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202106/file/1622538188.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/jaxepixalexamesululegeni.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/rudenekalano.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_off0000e315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE315 17888 bytes
SHA-256: e0b5fe77b9946787e20e664982ed37d04d1b1ca4cbf9cf3e3ce1c94f26f1a905
font_01_sfnt_off000111ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AC 10468 bytes
SHA-256: 545a2356fe01087b0ad394bc4220abfaaacc33a170cc60d56e102c1f7fcd3f64
font_02_sfnt_off00012968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12968 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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