Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb5503c0190af827…

MALICIOUS

PDF

83.6 KB Created: 2021-08-16 01:12:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f74f0f5271ba2e35c3e29c47a7cf61ac SHA-1: e6216ee7ed919345deeacbdfe7dcc2274c3121da SHA-256: eb5503c0190af827eb110e72763b4175701c0583797d425ba9479ab7f6750691
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malicious content. The presence of a PDF_SEO_DISPOSABLE_LINK_FARM heuristic and a high ML score indicates a malicious intent. While no scripts were explicitly extracted, the nature of the links and the ClamAV detection suggest it is a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://enotecagaribaldi.it/userfiles/files/wuxin.pdf In PDF document text
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/7176883898.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4651220784.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/6960709581.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/vowawuta.pdfIn PDF document text
    • http://staropolski.net/Upload/file/69034148534.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/81859700537.pdfIn PDF document text
    • http://shs1977reunion.com/clients/41590/File/tulilimitikoja.pdfIn PDF document text
    • http://benrassam.com/uploads/files/54749631753.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/gupirasobobiloli.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/14c869a4de5f0826d08016a43f38bcef/visovupifawiwowel.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d14d32e721---96559030714.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/jawadarelusereru.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/8f5a413da25c0ac15b4beb22cfb688d7/kuzilifonodibezekinek.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16096272a02d90---57306347012.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/suwuwagotefovax.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/lisozekakuvoxezuzuges.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/26195443511.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16083955d67136---waverisexuvujiseludorif.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/32764977439.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609b90a40fa0f---vulugeputupupika.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/deromawuwasekimi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=wwe+2k+android+offline+apkPDF 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_off0000e120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE120 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF932 17836 bytes
SHA-256: e20e0d4a14d6c41e082b0425a86133519b367cc80e4a2121a5574c44e9129622
font_02_sfnt_off00012852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12852 10516 bytes
SHA-256: 5a33e932d384e91e3f8e2d47c9a687f9d66f72a1c335a39acd9af1d7f3a13407