Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffe51bda372fc89a…

MALICIOUS

PDF

84.3 KB Created: 2021-09-09 12:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1cc50e5c3a3fbeff3f3701de95beb727 SHA-1: 432a176eaefdd2734312bc7232d5ad70fb449ed1 SHA-256: ffe51bda372fc89aba3dc3a8385031087bcf5fea14ccbd46dd725fd9f74b108e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external sites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm designed for SEO manipulation, such as 'frozen+2+full+movie+free+download'. The presence of a 'Download Button' heuristic and ClamAV's detection of 'Pdf.Phishing.Trojan' strongly indicate a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cructi.ru/uplcv?utm_term=frozen+2+full+movie+free+download PDF link annotation
    • https://jamuiboe.com/webroot/upload_media/mumefejupigagoxurotipubi.pdfIn PDF document text
    • http://tjtvina.com/Upload/files/78343992908.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/mupipuwi.pdfIn PDF document text
    • http://mariancozma.com/_user/file/pofarokixosomifemazem.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/93962979524.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/7077918558.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161398f293a1c3---lonunonexaxalabesesidaki.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/serusodumopan.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210903_d4e1c.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/vofugixomebidarowi.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/57046577686.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/sesefidixozoti.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/bavutodapazibepanip.pdfIn PDF document text
    • http://becskeicsodajo.hu/admin/fck_upload/file/segexumabugu.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613813ec3c1c1---vapejusufusanupo.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613719f8f051a---siwebozefegawibatibaneji.pdfIn PDF document text
    • https://kawanmto.net/contents/files/vijab.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/56033533461.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/44703342267.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/mizifoketalusuvagidefono.pdfIn PDF document text
    • http://transgusto.ch/userfiles/file/20111969568.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133140366c11---jotemabupukuda.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_off0000e615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE615 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE27 17292 bytes
SHA-256: 38f09ed1f667513703e91a5e48d5f7287b88ac9a3d603d931505f3d857e4a68c
font_02_sfnt_off00012b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B0D 10660 bytes
SHA-256: 97adf5d16f7c91e554055807e258f8578564d2cc116bcd45ac4773406eb66bd6

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