Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5c545e045a34300…

MALICIOUS

PDF

99.6 KB Created: 2021-09-03 05:48:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 157dcbe90f944095c8df6ef286e5cd2b SHA-1: f775a7f7e98612a03e782176256238aceaec413d SHA-256: c5c545e045a3430098523f135c2ebc84db7af2b35ba4559c64d8b8cfc796eabe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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=rational+expectations+vs+adaptive+expectations+pdf PDF link annotation
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/8587816e5382798c42ff96e6410b2c3d/sugusitawaworikira.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d4927c27a7c---48964759146.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dae6627e14d---bagew.pdfIn PDF document text
    • https://palet-school.com/files/files/10124131986.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/mulimovu.pdfIn PDF document text
    • http://itssilvertime.com/clients/2/24/24efe347a73a8ce028152bf895bc11a7/File/61608258585.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/45290785655.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/rujerow.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/80235359363.pdfIn PDF document text
    • http://biotledlight.com/userfiles/file///kovomalunos.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210609042203.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762156018df---bepewatorogarifugixipuwu.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607562996d912---15614893408.pdfIn PDF document text
    • http://guchenes.com/d/files/66462981787.pdfIn PDF document text
    • http://beateromer.com/bilder/file/60359534420.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/nibara.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/55238832792.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/jagijasotefoburarix.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/rarimikon.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/161184863e0e89---23055250323.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/c968955d8dca0fd4f4e413cd01a9f1e7/mukisosepaf.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_off00011fe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE3 10724 bytes
SHA-256: effa3601ca01924fae0d8ae6eb5d651371922af86a15a1e0eb978c1cec7a52f2
font_01_sfnt_off000138b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138B6 18312 bytes
SHA-256: 87ca6d787a328675cddf2b6091aec7142ccbcd76a2185794b7a38946ef75d5ff
font_02_sfnt_off0001687e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1687E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1