Malicious PDF — malware analysis report

Static analysis result for SHA-256 61ce54d3a90ed149…

MALICIOUS

PDF

74.5 KB Created: 2021-09-16 18:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cdc534666509c138304db9bb4421055f SHA-1: 1507b92797709b2f64583947eafa9a99c8fd6b17 SHA-256: 61ce54d3a90ed1497d932f0798fede8ee59460de9d62fe6e67ae3d9a88355330
164 Risk Score

Malware Insights

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

The sample is a PDF document containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. Heuristics indicate the PDF acts as a link farm, directing users to numerous external URLs hosted on potentially compromised or disposable domains. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://irlanc.ru/uplcv?utm_term=android+display+loading+animation PDF link annotation
    • http://vattuxaydunghl.com/userfiles/file/nitulojum.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/76653657571.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents/files/93110298584.pdfIn PDF document text
    • http://ciba.lv/uploaded/file/97631624689.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/54074440079.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/71585916811.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/35537582464.pdfIn PDF document text
    • http://numismatika-nbkpdy.cz/userfiles/file/25015658864.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/xubafegijemit.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/zizejozaretoremi.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/17195024216.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/48328381994.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/wobusakiwizodor.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/5657869121.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/50072504746.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/37314456374.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/wetamabumoduwusilatu.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/torulemorexuvuvejefibodam.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/jugoki.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/ximelitedamu.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/83788587295.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1613061ea7e7b0---67374400808.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/42448047296.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/8e1a9a98e663cfb0ae627e8cfd3c52eb/situsefesabena.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5e6b0f800---tevow.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_off0000c1ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1BA 16120 bytes
SHA-256: 5ed934acce8b73bba4185f75592d0d5678892fc7b25a70c6440e946685e2c81b
font_01_sfnt_off0000eb8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A2 10700 bytes
SHA-256: d5acfce1345e68671a30f0dd4e70e1fee80395973641e0a4609b451fc042854c

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