Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1e65dec09963dce…

MALICIOUS

PDF

83.2 KB Created: 2021-09-22 20:02:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9f2d9a618bf2b38eb18d8070d8006b15 SHA-1: 2588050b478c6d6c7e815764cbaa119bc186577d SHA-256: b1e65dec09963dce0ea434aff87c468843fb213e56ae9b1af07142ca645381da
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The presence of numerous external URIs, many of which are part of link farms on potentially compromised or disposable hosting, further indicates a phishing or malicious redirection attempt. ClamAV also detected this file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://garglob.ru/uplcv?utm_term=format+flash+drive+android PDF link annotation
    • http://101-games.ru/images/uploads/files/60347826765.pdfIn PDF document text
    • https://red-adlay.com/upload/files/87425242002.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/tunime.pdfIn PDF document text
    • http://logicamail.it/draft/media/61432804514.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/86618962077.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/19774209445.pdfIn PDF document text
    • http://rongqichem.com/upload/files/bobaxidon.pdfIn PDF document text
    • http://cuacuonbinhduong.com/upload/files/19988582938.pdfIn PDF document text
    • http://teresachild.com/upload/files/senejamalo.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/15928509087.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/h28jj7k7rb12sjvkbbfgt6i170/1517737767.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/wozigagareta.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/nilabufovokolev.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/zojafeguzuz.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/4009581438.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a75291e39---mekigimekelopi.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/kaxomomutafil.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/crm682ljvuote27hjgv8mgq0f1/44538827781.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/reruzo.pdfIn PDF document text
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/54333446296.pdfIn PDF document text
    • http://healthywithhart.com/res/file/25905749820.pdfIn PDF document text
    • http://skazka76.ru/pic/userfile/94697188873.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/gvo8br9da716nma5f23hp6642v/boxaxewivuwak.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/nuwoxogamujavarifadalo.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_off0000e0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CA 17928 bytes
SHA-256: d510c38946fd679628bd1da03c909244d6e21d82b8aefa301f4164c7fb345d9d
font_01_sfnt_off00010f62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F62 10660 bytes
SHA-256: 484a81c5e06a6a0c559f45a8c109011f1ff0ee9c4266daf431a4de323329fa16
font_02_sfnt_off0001279a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1279A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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