Malicious PDF — malware analysis report

Static analysis result for SHA-256 33cb94c99d9168f6…

MALICIOUS

PDF

76.4 KB Created: 2021-09-09 11:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c4e3af9678e6fba2cddbb2e8ac9bd99a SHA-1: e8ae5e8d837f150ae97c12502573b2e559cfef52 SHA-256: 33cb94c99d9168f67955d410c58b8ff88ea0bcc8b02983f0f6bc1df76adfb465
204 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, with high-severity heuristics indicating embedded JavaScript and PRC/3D content. The embedded JavaScript is likely used to execute malicious code or exploit vulnerabilities within the PDF reader. Multiple URLs pointing to potentially compromised or disposable hosting are present, suggesting a distribution mechanism for further payloads or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • PRC/3D content in PDF high CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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.
  • 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://299-45.com/CKEdit/upload/files/xudapak.pdf In PDF document text
    • http://etabetasurvey.com/userfiles/files/wemel.pdfIn PDF document text
    • http://symbolfoods.com/files/file///vurozonaz.pdfIn PDF document text
    • http://gucaoyun.com/uploads/file/08195158300.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/wewexatu.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/0c0ce18b3c94d920cf7a151672fcebec/9400271885.pdfIn PDF document text
    • http://ashioke.com/images/library/File/riwegofafizimugez.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/b645edd9988de1af3dbd532ddfdc0774/nabopugevagogufe.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/101e8bd27935d385206cc0a02e7e163e/86531196445.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/94268300725.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/54653371790.pdfIn PDF document text
    • https://wigs4less.net/nbloom/fckuploads/file/72774847015.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/rupexodofiv.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210903130110.pdfIn PDF document text
    • http://huthamcauquanggiap.com/upload/files/29635402543.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/toxupumopebijativubibelix.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131c5fabeb2a---jotogebitemopeme.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/66516404420.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/gunixe.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/88529546146.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/72536440263.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138c33db1c70---95679493890.pdfIn PDF document text
    • http://enricobarraco.com/files/42365055235.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/89857835118.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=wifi+hack+mod+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_off0000c77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC77C 17424 bytes
SHA-256: 0bea7530b7a992c4ab16241a5bb864930dc02e65ae223e938e76dd418328c227
font_01_sfnt_off0000f48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA6 10320 bytes
SHA-256: edf2db24d16a9146b358f5b3efc36e38e2038debdd9e0d62ec50a1d8d248d559

Open this report in the interactive analyzer, or submit your own file for analysis.