Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff587fc6b67aecbe…

MALICIOUS

PDF

79.1 KB Created: 2021-09-22 15:32:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7a142f5e4be7113b127c4e80eeb8ec9e SHA-1: 8c92b60b8ea0705c831ab25e882277dedc2efa89 SHA-256: ff587fc6b67aecbed2101ae021c17108efe96a754fa56847cab532dee41099b3
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ClamAV detection and an ML classifier. It contains numerous external URIs pointing to compromised WordPress sites and potentially disposable hosting, suggesting a link farm designed to redirect users. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://cructi.ru/uplcv?utm_term=jeetoh+app+download+apk PDF link annotation
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/642723d8339424d9e7a34370fd2612c1/tujibinilako.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/medaginifopaladuxozepevax.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/s4mm1q7nhlu4bp2osvd38015s3/51761437810.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/s0tpjf30hsgjf043cgiks71qp5/kejisabisewenasopenafidip.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/zovep.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/zomesunujoxulanibuwela.pdfIn PDF document text
    • http://geoman.cz/data/file/4788727353.pdfIn PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/18825668645.pdfIn PDF document text
    • https://abbma.in/admin/uploads/file/jinutavagabudujisaxevar.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/rekajefosojifobixiwef.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/3568129477.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f9bf1d6a7---pelevezifitinikofilibu.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132449be8f52---86790083320.pdfPDF link annotation
    • http://www.kotolantopeni.cz/files/gatewatuxisinimijilof.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/71920172424.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021091014501861.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/6417008939.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/bufukogubonunotukawovikud.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/20091180430.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/zekodik.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/jutuw.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161351eec2fbca---dadikozamemejowaperu.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/50422087989.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/wozinuga.pdfIn PDF document text
    • https://szabolcsipeter.com/userfiles/file/46065211027.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_off0000d40e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40E 10300 bytes
SHA-256: e48a659ddd9c90c612a34a4d5c0f0d7b077f83fb17f148805759cfdfa6782827
font_01_sfnt_off0000eb45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10357 17084 bytes
SHA-256: 2954daca02a7989b7cbca4046603a985fec63464a07499d4addd6ceec7f9c2fb