Malicious PDF — malware analysis report

Static analysis result for SHA-256 9652ce8b883d5cd7…

MALICIOUS

PDF

84.0 KB Created: 2021-09-23 13:01:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 27f254004f3a38b8a022cb0cc051e37c SHA-1: 372a6d28dbf9a9196fa5b255d8662cdaa314af44 SHA-256: 9652ce8b883d5cd7c9e8859a7dfb7b9a1597d40bbcca4cd2f2e2e52609d27b15
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs pointing to compromised CMS upload storage and disposable hosting, suggesting it's designed to redirect users to malicious sites. The document body is heavily obfuscated and appears to be junk data, providing no direct user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://coretry.ru/uplcv?utm_term=where+are+the+metals+nonmetals+and+metalloids+located PDF link annotation
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/b9c11543e31263aa6a0aae56040c07ac/28188171602.pdfIn PDF document text
    • https://motecx.com/images/file/xezevepubovexasexu.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16143a3ebadf2d---96594871950.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/016c2f0c277d1582f92b52e5b3c84a4c/ruxigafanezuvopudininep.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/zubizarixinikome.pdfIn PDF document text
    • http://klinok-saintp.ru/files/vewugibi.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613f137e5f18c---ditaxunubikedolewefi.pdfIn PDF document text
    • http://nordicwalkingturak.hu/_user/file/famasemavejivo.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16140c41b4123e---80766671800.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/garilinapafipumiwi.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/pivafepililonifadekapef.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/58029668349.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/10876510151.pdfIn PDF document text
    • http://bresky.cz/res/file/puzik.pdfIn PDF document text
    • http://svb-volleyball.de/userfiles/file/konosixuzepixezixu.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32353612054.pdfIn PDF document text
    • http://kiajihlava.cz/UserFiles/File/bixiluriwajofesiwik.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/53717225739.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/11904541623.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161447913c4430---6772545697.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/161422bea27980---91187899115.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/kifivuvexemevo.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/malomitifasi.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_off0000e48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48F 10628 bytes
SHA-256: 500b1a2ae28597a8e3caab8e6e2f181b2e23d6e3cbc211299d02078a22d4f370
font_01_sfnt_off0000fcba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CC 17508 bytes
SHA-256: b242971228aa7b2c1a6e0322b315ba92952d43947a8cade0a41d603e9549e4e3