Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e8b0fb18d863ba8…

MALICIOUS

PDF

68.9 KB Created: 2021-09-25 23:23:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 763656b9f989480266a74ad761aadf17 SHA-1: 47b2c82ce28480a29ddea91e1d2e4a87662fbc7e SHA-256: 9e8b0fb18d863ba8a0ce4d40b5a8845508d47a3fd9871064669f69561fdb6810
196 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document likely prompts the user to install a fake browser update or extension. Several URLs were extracted, many pointing to compromised CMS upload directories, suggesting a distribution network for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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.
  • 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://medvor.ru/uplcv?utm_term=god+of+war+4+android+apk PDF link annotation
    • http://siltherm.com/ckfinder/userfiles/files/58729730486.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16133f12c1d712---jafejitu.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/77346036586.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/ridekapevodibisisuwukofig.pdfIn PDF document text
    • http://tplustech.com/images/ckeditor/files/fefudodowoxer.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/15tk438ojaevuq3kobn6as4ut7/lowirima.pdfIn PDF document text
    • http://kprmk.pl/userfiles/file/74650207751.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/8uqnsq6veb1vq707es8ojkiiis/84873653277.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/veluluzijamudifomumanat.pdfIn PDF document text
    • http://emannsltd.com/userfiles/55993132387.pdfIn PDF document text
    • http://ktcz.eu/files/files/pejawufulurakejojoteze.pdfIn PDF document text
    • http://kabaretyimpresariat.pl/Upload/file/64956243091.pdfIn PDF document text
    • https://ikima.fr/uploads/file/ronunabi.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/30891731441.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/vikubujozaxupebiv.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/sofajuzipubusururosele.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/lagoditesevitanu.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/pudadarusorad.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/20295353972.pdfIn PDF document text
    • https://rwd.webseo.tw/upload/files/79814364749.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/5dcb912cc20ac1669a9a0a2c61e43b65/52767225310.pdfIn PDF document text
    • https://proxus.nl/file/56990022389.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130927cabcf2---wuwejufun.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_off0000af44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF44 15660 bytes
SHA-256: 958a21bfd0d2a0a07b9bed3570fc2a3b088ebb58aa3e46f949975865037798dc
font_01_sfnt_off0000d6c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED7 10344 bytes
SHA-256: 567e03b84552a89b0456af2be6b2f5b49c961cc2cde2b2433e4b986e63129e24

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