Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5ec7e587846e08c…

MALICIOUS

PDF

73.7 KB Created: 2021-09-17 08:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 5f3a558b623c90594f73523385c6eb04 SHA-1: b9096ceae629635ac4f5099eec84da1d71a42fcb SHA-256: a5ec7e587846e08c2aeb4184931d3be92c872b15dacbfc2ec3ad2703558cc40c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that function as a link farm, directing users to potentially malicious websites. Heuristics indicate that these links are hosted on compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://laborke.ru/uplcv?utm_term=watch+mar+gaye+oye+loko+full+movie PDF link annotation
    • http://meble-tk.pl/userfiles/file/wiwiritatiwowaxad.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/69471571148.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/12475485470.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/99460116815.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/84486586362.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/bawanapepewebifufedol.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/8e2ad48c6125e5a2212cf80d053b15df/88698581165.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/35547980822.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16131fce52cbba---kudezevusubafonasimixozis.pdfIn PDF document text
    • https://magerp.org/upload/files/sibep.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/tuxelinigoxovokuvowoke.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/maduwanamenej.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/89698123351.pdfIn PDF document text
    • https://mimpi1pusat.com/contents/files/gegizuwuweded.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/11985444688.pdfIn PDF document text
    • http://itena.si/uporabnik/file/tuxuwoladajewikupenor.pdfIn PDF document text
    • http://taociren.com/upload/file/210904235217947002rbsu0pw4xtgy.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/dedituzupisejil.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb70d64205---foravujo.pdfIn PDF document text
    • http://synhbio.com/upload/files/97700118761.pdfIn PDF document text
    • https://polenhosting.com/calisma2/files/uploads/62190083494.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a0ee72fa0---rulekaruxakotutotesigu.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/fegabemetefodabetejuk.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135118a201c3---66782514262.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_off0000bcb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCB5 16796 bytes
SHA-256: dc6389e297d9bb7e577d22c758ceb770f474ea91be20e4425a276084ab6cec39
font_01_sfnt_off0000e811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE811 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10028 10876 bytes
SHA-256: 472c40dbdb7659dd4581c9e8d2afd72a96ad7258aecdcd3cad17a3415b1cbb63