Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5f3bc983151f9e1…

MALICIOUS

PDF

85.9 KB Created: 2021-08-01 07:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6b5541fc99995e79a86fd25c0dff1307 SHA-1: 2cddd1a3561e21067bee8e8ed90b7ae64e883474 SHA-256: c5f3bc983151f9e167cea59eb84f067e89ae1d9ba9c2a6d95696b43b0aaa4857
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://infrive.ru/uplcv?utm_term=how+to+clean+bissell+proheat+essential PDF link annotation
    • https://nepalipublisher.com/ckfinder/userfiles/files/70771368948.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210717_F6374BF5DCA7DF94.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092da1d89491---pezinefodemavoledi.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c89b850a897---zusewagex.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/faburifaturomafasej.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc2de69295---81608418558.pdfIn PDF document text
    • https://henklinders.nl/henklinders/upload/files/70300859262.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/gexoguradixadatesose.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfd991cbb5---tofufuze.pdfIn PDF document text
    • http://proxima-design.cz/files/file/tanupilelexizagugewuvoso.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7610a6e7e8---81054324399.pdfIn PDF document text
    • https://susta.vn/userfiles/file/91882626763.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608255190013e---nokasuditijutodi.pdfIn PDF document text
    • https://dhesient.com/media/tibotivomojazafemopijorig.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/6cn0l6r0vmsrs28kb7uhqafbj1/puxemobi.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/524a06cf447828360f7dcdcd2c6ca569/3395746825.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/ruzerujejigipat.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/578504402.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/lebalonetotelikawonene.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/os3m63sk4pceehvhtnt8qv0rnf/fobuj.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/69422171060.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/53545ed232a1ce5d56fea13d7fe5fb5e/58767413484.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_off0000edbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBF 16936 bytes
SHA-256: bfed68f883fad0d229840449ead5c604f019c5c24d0ade510e7c7ebbd17a33e7
font_01_sfnt_off00011a01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13218 10688 bytes
SHA-256: 96359353032854616550e043e56a85f7f960000dec9fff5835906d9877a370b7

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