Malicious PDF — malware analysis report

Static analysis result for SHA-256 f92366d15a98bb2f…

MALICIOUS

PDF

85.4 KB Created: 2021-09-01 05:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6f33df22d906e99119f7dbed727709bd SHA-1: d219c5dabb9e93d4686b50e7bc454da70d62957a SHA-256: f92366d15a98bb2f50951d9cf104b54e579250e2a127df3f567e3d91ca2e727e
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. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload sites and disposable hosting domains. The primary attack pattern involves luring victims to these external sites, which likely host phishing content or serve as downloaders for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://rubfila.in/files/file/vowalebodanogoxinu.pdf In PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612773699afbc---46662842823.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/714a3665b5ad32e969335199c94df24f/widig.pdfIn PDF document text
    • http://strandedtattoo.net/file/wiwojonovofek.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a71c1d5eaa9---80598839017.pdfIn PDF document text
    • https://master-service.ro/images/file/52949097174.pdfIn PDF document text
    • https://shidoremicrosys.com/media/63191736193.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/62df205425ae2ae08d083fd8f70f6fba/75126832510.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/c9dq1iabjft7hmhahrirjpvf6j/dutiwuxuki.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160886ac1061df---kewexeka.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/jidut.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/pebapemakapubuzeranove.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160db891b2eba2---70177307713.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd17e82ea3---tavabapipufep.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/nuvabawomikopomexumeg.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/b6aed7582f1e424a61c4c8aaeef235fc/wabuwuxonalonir.pdfIn PDF document text
    • http://vizcsap.hu/files/file/zabufanetewe.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa6c123a04---62703979890.pdfIn PDF document text
    • https://huaku3c.tw/uploads//files/202108070500049694.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/b313bf16d5e2f5f0b6a3742a5c42e354/paxixulalusezekow.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/3743f80abf35447eab457c016ffeba64/4235259656.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160795a4673150---10880147637.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/vajitidefevafosigewiwesi.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/279ced279b3bac6f70511d8e8867ca22/59443727629.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=cost+of+imprisonmentPDF 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_off0000eaba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABA 17436 bytes
SHA-256: 628b497011bbb996466e0c4a458031c49a3bc6e14925a7b257caee89620c12f5
font_01_sfnt_off000117b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B3 10340 bytes
SHA-256: 3d84ffe225fcb14afef66593a126ee30f06f764c52f93f0084614ef96c85af22
font_02_sfnt_off00012f03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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