Malicious PDF — malware analysis report

Static analysis result for SHA-256 23ec082cdb82461e…

MALICIOUS

PDF

70.6 KB Created: 2021-10-01 22:44:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 08aba956a1fe2433a8ea8f46f5eef604 SHA-1: 79bc92a1f407baf871ff507043728b3903887172 SHA-256: 23ec082cdb82461ea7bbe0938e11744d1a2a95c5b1b92260ba0f4e76192a647a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The presence of JavaScript suggests an attempt to execute code, likely to redirect users to malicious sites or download further payloads. The overall structure points to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://wastran.ru/uplcv?utm_term=porn+sex+apk+download PDF link annotation
    • http://profil-metall.de/content/uploads/file/98637140290.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/womuzutawawukume.pdfIn PDF document text
    • https://33mobility.net/uploads/files/37689152160.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/15745745044.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/kejino.pdfIn PDF document text
    • http://pribatu.lamilagrosaimport.com/images/files/jadunidado.pdfIn PDF document text
    • http://theonejsc.com/userfiles/file/17495191158.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614781ca84b65---jofanajesobalidijiwano.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/75214253267.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/falimapew.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/67244143281.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133625424147---ravapiwiwaguwosego.pdfIn PDF document text
    • https://thaodienland.com/fckeditor/editor/filemanager/connectors/php/temp/file/47867789840.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/4105c738c21cc5d777152b77ef85d7dd/2542757921.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/dozosilifelame.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e147c0a913---purifivoreguninufuzulu.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c891748b34---minarifubi.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/56543486774.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/7344138599.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/77168646850.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/jizosa.pdfIn PDF document text
    • http://www.idukkidiocese.org/files/js/ckfinder/userfiles/files/sudikodugeduvinatomuzepez.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_off0000b212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB212 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA24 16732 bytes
SHA-256: 4f38d28573baf78a33bae9757c36dd4ea07dcb4775fc85a04815259368a2fa7b
font_02_sfnt_off0000f503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF503 10476 bytes
SHA-256: 11222ab6fe62077bc372ae07218cc8f73cf1143287babb0b2c5b17addc6b1d8e

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