Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a5770acdb52cc09…

MALICIOUS

PDF

87.5 KB Created: 2021-08-13 14:45:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 74f22f3920b3a818e5047012ba0642ea SHA-1: 552404f76711a2f3dc4641af9cc2fb7a9d581307 SHA-256: 4a5770acdb52cc09274f122b0c75166e0bc32efa323413b41ed75ec72145e917
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external URIs, many of which point to compromised WordPress sites hosting other PDF files. This suggests the document functions as a link farm designed to redirect users to malicious content, likely for phishing or malware distribution. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://krisoc.ru/uplcv?utm_term=how+to+set+time+on+citizen+eco+drive+perpetual+calendar+wr100 PDF link annotation
    • https://ecohort.com/userfiles/files/xiwobijaga.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/nuramopuxojivija.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/84f2dff97f98b7496b1e870e9aedbe85/xowumeb.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/72403d822481c1c0a9e17278ba56f66f/jexemixorunusomowatin.pdfIn PDF document text
    • http://fructusartis.com/i/File/50878343267.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/25624307185.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/nunetodusotilukolelaraw.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160dca4ee947a8---pakosoxisob.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/oe8jl7jcsq47tq1mdqonh44gk2/xumobutinijapiloda.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc9643dab8---xefofufotuvotuja.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/17753668691.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b32a6bb7dcb---84671419424.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/vowuwemerusevi.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/5ef1ef649fe199c428ed14331484a482/78088105468.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/7e9841e613ade30b150b6d00a5921a03/99573383268.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1efd00b7f---10887835547.pdfIn PDF document text
    • http://short-story.ru/upload/file/pagonirewebeka.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/rutoti.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/penepezebobevasejugebape.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/94630415992.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/1aa2070d55e5630f47f5d25d0dc85b77/rutukusekinesa.pdfIn PDF document text
    • http://richiefamilyreunion.com/clients/7/7d/7d03816b951c94fc7c065ced7c7ccdcd/File/webop.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160e678cebf8ae---79650584428.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/kowekupetitaz.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/53ca3224b8a88192ff68a35d4d36a18a/fobuzudegiranuvuraxujuvu.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_off0000f03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10852 11152 bytes
SHA-256: 18c644f337f6d966f43cc62ce93e3d8bbef3c86513b1bd18a90e1e78bf6e97f5
font_02_sfnt_off00012271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12271 17060 bytes
SHA-256: a6e16d84bcfeb326248338bb3905bcef3dca601b11e303dc302835dbd7b042a5

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