Malicious PDF — malware analysis report

Static analysis result for SHA-256 170b1a5c4f2816ee…

MALICIOUS

PDF

82.0 KB Created: 2021-09-05 07:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d04bef3c38d4fc02b6c9ec7172840b9a SHA-1: 73c790cadd5c03470b425a41d9a601bdc04e190f SHA-256: 170b1a5c4f2816ee68e80df4061fa4b0a455b001e76a0d216827f9e0cec4a8c1
216 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier. It impersonates a cloud document lure, instructing the user to install a browser extension or update. The embedded URLs suggest a link farm hosted on compromised WordPress sites, likely serving as a distribution point for further malicious activity. No scripts were extracted, but the overall pattern indicates a social engineering attack aimed at compromising the user's system.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://catamma.ru/uplcv?utm_term=myself+pdf+file PDF link annotation
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077cc662253f---89399617125.pdfIn PDF document text
    • http://anm-av.de/uploads/files/gisibexegonuxow.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/20558360447.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/18faafdf2e612a4c505b307606bfd95d/54150258570.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/25095929713.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/9ff0aa6e238cd5fb8a34536224b356a9/bodutusapolapokisetaxoxi.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/h2bfrs2jjdq6iro7v1km9ktn8g/22295923675.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/3457943963.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/lokexunogosufubafeginu.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/1cbc4c601159b92b6a3c8a5cc9dd1af6/85884915862.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/minutagobujawewonu.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4af8918330---zutimozewirawuvuzo.pdfIn PDF document text
    • http://strandedtattoo.net/file/53750323524.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/8691761229.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/id4ivkc5fahi5nq428h1pj45s3/68017177186.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610732b8a8668---xemoweburitupegojip.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/55579974213.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/3cdbf009cef5b766a3b1a8fe394119e3/38206360071.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/lufifisapogixenan.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a5aceaa81---xalovodofemevex.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/xolilitigude.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/fevojalemopowofobajan.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/4l7nubqi1occpls11h42o96upr/sedozanasifiwiveluwanup.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/28008758797.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_off0000de0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0A 17792 bytes
SHA-256: 4f2c00e307469bb4b2e2b6372d28efb1e789b7ebf4ba1e7b50b66c24ad6d1105
font_01_sfnt_off00010c67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001247e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1247E 10012 bytes
SHA-256: e6e4235e41d021e921445f21ce88192d46b4f38b10e6f1400d088bfc90bd5e3f

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