Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebc9f79b6598b79b…

MALICIOUS

PDF

89.8 KB Created: 2021-07-07 09:28:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 19e0fc4520eb1c7de97542accaeb12b1 SHA-1: 9f7210e7e2a2ced711887cfc278600b18eb389b7 SHA-256: ebc9f79b6598b79b8f651107463bb3befd110d92625576753de53780105d32fd
156 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 file contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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.
  • 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=shadow+people+what+are+they PDF link annotation
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/2d14f4d9e3ac6218125f90d86df021f9/kodufoparaxalajoludonedu.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/bfcd0f4a4a0c04a684d8bc7481d1660d/22483557666.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1fcf8c0283---48951081287.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609a100c1103f---66963348782.pdfIn PDF document text
    • http://nctpa.biz/clients/5/51/51e593b678cc4707ea5ff7b662bcbdb9/File/74406734719.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/8522444839.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/a31adf21be7f74f15a087608fb55dbb9/woven.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/f8edc3982546c61422a26a3288cf54a4/rirejumaxupa.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/xuxubu.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/zafugarizafugaraboroni.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/sixisubadud.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/89466430406.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/13551db4a93e315eaa54c8314897347e/53050906328.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fb4c15d54---67238869908.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b7a4f1658---4534311590.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/momaze.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/bb9ad7f731961c085cb3047315b85ad3/najazasimefon.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/f1dbd57038ae218cc3a564fd0255d9c0/80867154881.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16089ae4922555---xakezubawinajumabinak.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/65561587604.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b89da02e68a---xowavojofimaxuvoxi.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/39504162336.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/888614c4d665686319a88acb754cfc24/20756916210.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/72904586016.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/sknpftpk45btq7op38hrkbe91e/36094888465.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b316a811903---lugoxarudefikisigev.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_off0000fc8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8C 10400 bytes
SHA-256: 508c4827469975cb2356a2dfb65cdacfd53ce7c57eef7ea32d9fcbb4e65b24fd
font_01_sfnt_off0001145b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145B 17436 bytes
SHA-256: 4a85db65a2cc4b07ba53afd13e06c08f9ebe8a21160c78802173ad6f305d93e8
font_02_sfnt_off000141a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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