Malicious PDF — malware analysis report

Static analysis result for SHA-256 be30fb6ac66844ff…

MALICIOUS

PDF

77.8 KB Created: 2021-07-04 07:34:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4ead29acbed13b0f756864efd7209241 SHA-1: 8e9f7dc2603a4196f801785847e3f609afcca260 SHA-256: be30fb6ac66844ff97eb13841c34dd88b26aaf4c1a985cdc3bdc8c773321f6e7
172 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains embedded JavaScript and links to compromised WordPress upload storage, suggesting it is designed to exploit vulnerabilities or trick users into downloading further malicious content. The presence of a download button lure reinforces the phishing or social engineering aspect of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d8cf645e6f---zowopelorasetojabarugam.pdf In PDF document text
    • https://radmangroup-ye.com/rgfiles/file/58293206311.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/5123411721.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/vibebe.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/48882167850.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/34482465080.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4eb81eb9b---temowewigadufurejux.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/n74sddkg2h9gdi1vah6gn511uu/2689962316.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/hl5s4sd3meubn40oul9lf6ipic/90098865439.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/vosigudamorunekikega.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/jt8rjesrmmg3pjtbn53l1l09ah/4200389621.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a6c421d05---pobasugejirokoxe.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/xutumevinodopi.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8fe3d6ba7---turabosigupadarulabukap.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0ad96daf5---47149346858.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/cb021ccb3f60c0acb2c890f79eb89159/zemen.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/75351923017.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/989ee2f0b0edf1614827ce3f7a7401c7/gezewifasu.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b984e2875dc---15606120009.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/52457193218.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770d655a116---nitutituduwubojenetop.pdfIn PDF document text
    • http://aweibel.com/Photo/file/palevalukipibesipo.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/busigupukiduzidu.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/696c3277295ecab93dcb388f04fced66/pekelawuvax.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/kcdqhu6ibmobscea9pb0hmctb0/93473123014.pdfIn PDF document text
    • http://ychnjl.net/userfiles/files/84723881627.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=theory+of+computer+science+by+klp+mishraPDF 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_off0000c74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC74A 18276 bytes
SHA-256: ac16bec7079677f1d543dd5177d9a683e74aeed4494372fda769e5efd702d012
font_01_sfnt_off0000f7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A1 11152 bytes
SHA-256: a14ae8ce28f7298e453c8d88758b18a1aa772c4f699ccbfd9d0d5355abade362
font_02_sfnt_off0001115e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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