Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7c67209c5548922…

MALICIOUS

PDF

82.7 KB Created: 2021-09-06 08:28:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 41e5af8a6806256aa4bec8c88ffcf738 SHA-1: 2e6649424024f89061332998e39018e6ec231c88 SHA-256: b7c67209c5548922512714e89d3adceff4e9aaae3204244e73f54f6038c70afa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links to external websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the nature of the heuristics suggest the PDF is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=hepatoblastoma+pdf+2017 PDF link annotation
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/5dbb29e0e119007f0e3e74aed0c8ba33/pijaxu.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/gajoronefavoxos.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608319dd9991f---90529763544.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/ii3dfc3psbsnkpr4o0imsuna31/46978624084.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/xamoxomipigavifowe.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/edb2a6e632b10de444190a8530f588c6/pomikobakaf.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/59361208275.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/gae5of0h53hv9ghjpo29puop21/kezaxekudilaxitepaben.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/nesutipujavo.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/6muumucv84dd0ekjikanmahgst/feberof.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/e8nk8v81hg0lifrm49tdvo4mdn/32320370993.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210605175822.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbc0a70533---tizowoduk.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/rolaga.pdfIn PDF document text
    • http://sshs61.com/clients/6/60/60e739d5a8cf4a6710e4f064fd99417d/File/paduwevegazupotufapamame.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/3dd485eba05b188c752f894c28033c27/69101704890.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/lesaxupugidepupan.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114a9e682f60---vufixixedozotilu.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/71512460448.pdfIn PDF document text
    • http://ashioke.com/images/library/File/vupoxebavegidipukiduza.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/35a09eabcc81e7b6733160c80b132b42/37545100445.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bacbf1cc2bc---mixezipag.pdfIn PDF document text
    • https://digireg.it/upload/mupuju.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092ad1240105---zalorapetipe.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_off0000dd3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3B 10840 bytes
SHA-256: f9cb686fb10ab7656c6ca8dbd80e46c449b52a116c3154ab427881c04735cd40
font_01_sfnt_off0000f629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF629 17964 bytes
SHA-256: 98bd04137afa5a95e9a5dc3006dbd0937a39213357173dc00bf76588f62f2d31
font_02_sfnt_off0001249d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1249D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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