Malicious PDF — malware analysis report

Static analysis result for SHA-256 37a2c509c9a04a68…

MALICIOUS

PDF

71.5 KB Created: 2021-09-27 10:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b0e8da0303ac37f573f100206297ba5a SHA-1: 444de84eacffb94ef12f9144125200247f6b91df SHA-256: 37a2c509c9a04a689f1ecba0d42a7136598fd72fbc7c5124d000e2b273a0ef20
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS uploads. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://irlanc.ru/uplcv?utm_term=idle+racing+tycoon+mod+apk PDF link annotation
    • http://oawebserver.com/piceditor/file/26961825830.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/89866395908.pdfIn PDF document text
    • http://vaithun.net/upload/files/85129367563.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/9giqq5c1n6tk5khndcd9p3uc1o/66617844198.pdfIn PDF document text
    • https://areicon.com/images/file/minedivekazare.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/38503976836.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/jefabiwuna.pdfIn PDF document text
    • https://docommerce.co/calisma2/files/uploads/29744430906.pdfIn PDF document text
    • http://nprofit.hk/userfiles/19906518003.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/kezetosusujivajetexila.pdfIn PDF document text
    • https://castel.ro/userfiles/file/zaxivevorufuveposuroj.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/xatelawaromuwalemikevo.pdfIn PDF document text
    • https://china-glass-mosaic.vegner.com/userfiles/files/20210905_212013.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/a58eacb3df7e6dd3b19139431a538c23/nirimasurujetuvevagebo.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff45065cd2---gepitimuse.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/46240655940.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/mopaxe.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/8128589679.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/21ca0c1158fc10794f9b87c05c0a09d1/jagerexezebu.pdfIn PDF document text
    • https://matratva.in/userfiles/file/povidinuler.pdfIn PDF document text
    • https://mamalight.net/business_school/uploads/file/47563455427.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/81522666704.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/88749677220.pdfIn PDF document text
    • http://wakabaeducation.com/userfiles/file/wakuwiduneli.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_off0000b47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB47C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8E 16844 bytes
SHA-256: 75577ef212f0b9350e721c8f906af037b07c84d6cec03aad4221f8532c68d164
font_02_sfnt_off0000f79b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79B 10848 bytes
SHA-256: e536da1cc0b4a30e2503a9f41c2915a72369d72331e6a8b226a6c8f28c53e53a