Malicious PDF — malware analysis report

Static analysis result for SHA-256 eefe05fa88449d36…

MALICIOUS

PDF

69.8 KB Created: 2021-09-25 13:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6d8cf931f0a660bfa992b0e4517054d1 SHA-1: 9417281483203e06f61b5cf2b67d2a7d2671f96e SHA-256: eefe05fa88449d36006e8d0eab61384ecf2a7d05a1c3bfb79d8b14bc2c0960e2
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=ancient+love+poetry+watch+online PDF link annotation
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/dugepaxud.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613794fbe3956---sususexukipapufes.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9f059c7f4e6695d022e29c15301aa94c/5806616375.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/77571889482.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1613102174898b---sojex.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45771934110.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/witoxosupuvome.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/movepudiser.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/69173587437.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/18053378583.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/12613285240.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/9214355653.pdfIn PDF document text
    • http://peak-experience-europe.com/images/blog/file/peribodowodekovi.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/zozunaj.pdfIn PDF document text
    • http://tornyanggrace.com/upload/file/22248727991.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/75144766668.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/61759124267.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/rotuvatujimonobadufezubob.pdfIn PDF document text
    • http://psychologadamczak.pl/userfiles/file/96517053526.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/329417e11d3b8ff870dc765b41008697/debivomis.pdfIn PDF document text
    • http://decaldankinh.net/upload/files/fobadiwisufow.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/zalagujuwepuwofowobazi.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/neronezeredazufetamapujud.pdfIn PDF document text
    • https://rajaunited.com/contents/files/89720043665.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/75350883008.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_off0000b469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB469 10548 bytes
SHA-256: f81cee3351776f13d32031ef763d68bba9c64427e17d753edab7fd36953f39ab
font_01_sfnt_off0000cc7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC7D 14504 bytes
SHA-256: b99525e9d75eabc7d89bf8d2e0f60ae5488c88bb4feb18e05eaa0baaf87de263
font_02_sfnt_off0000f132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF132 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1