Malicious PDF — malware analysis report

Static analysis result for SHA-256 db5595b0c3f011dd…

MALICIOUS

PDF

89.3 KB Created: 2021-07-26 08:15:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: ef42ce99efbb19a888fa2d3952aaa235 SHA-1: a3ce9abd7036ed64b89af0079c205bcbd8f409c0 SHA-256: db5595b0c3f011dddf944658c23c09dcee49b02266b9946f865fabcaccc32efe
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to distribute malicious content or phish users. The document body was unreadable, but the presence of numerous external links and the high detection scores indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/c59bdec3dc707f642d59c672cc3f769f/fovego.pdf In PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/p74g6adbr7bj991e0ug3ep60lo/65991746158.pdfIn PDF document text
    • http://dgjst.com/upfile/file/99234704276.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c7842629d3a---vujatizisiriwuwiwu.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a365df1f594---78487266110.pdfIn PDF document text
    • http://seventyfirstclassof69.com/clients/60772/File/73614252183.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16241917033722.pdfIn PDF document text
    • https://wagaskar.com/media/91414713062.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c02f25a6755---73600334038.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/67muearqefn0a3qttcoiuilnt6/sukamigufuzonugobugikesu.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/tefefisusodupudenabamepal.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d94662b146---17243209832.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d6dcbb2032---16267973639.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a02f08beefd---gexixavanarinifowaxaje.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16084b81943665---tasopexajuputapetejes.pdfIn PDF document text
    • http://portableandcool.com/files/files/pirojarexe.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/e74d56ea3334088cd8f67d5e1cfb6757/7144322018.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/298d3c98693787d3414701d3962b412b/57006202311.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609867e76b3e6---pijaxu.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1d2ad7897---34194644355.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/xewasoxaje.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3ba88a8ddc---52404938504.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/vasomupataverejobidoved.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=jalwa+tera+jalwa+song+download+dj+remixPDF 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_off0000f861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF861 17352 bytes
SHA-256: ef54aa05fc068575d173d87eabd08d5d09f0e20eb6e3db7d8f7ffd666716bebb
font_01_sfnt_off0001252c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1252C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D43 10900 bytes
SHA-256: 110d5b8cbce6b528cedd66b7cd4a648dc3b5511676407c91d2adcd58b20d5f67

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