Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ff3fb66298f8736…

MALICIOUS

PDF

77.6 KB Created: 2021-08-10 08:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 58fbb018c116b3037c13798e7f1b5065 SHA-1: e27e7d89f8642d9fb8864f563f4a0ed1c66537b6 SHA-256: 1ff3fb66298f8736e1ffd8bd8b4553affe2270712c14d822c38f02b5677bf8dc
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a 'Password-protected archive lure' heuristic suggests the document is designed to trick users into downloading an encrypted payload. Multiple URLs pointing to compromised CMS uploads and disposable hosting are present, likely serving as part of a link farm to distribute the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://flexicourse.cz/res/file/degutujawuromimovitaxito.pdf In PDF document text
    • http://okfilm.kr/userData/board/file/91876361466.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079386d0b621---59404852572.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/junegijozunuj.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b07d16da838---badoputodeseguvetuku.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/20408478398.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/waxunupizusegijinubi.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b64e1e046cf---xewefewipawevegimakogu.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/xanonevosasufetababezi.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/45683871834.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/ledixupinexibepekafolutet.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/96vbf4nkkgp4ish64tchjngab7/kukotazusazogadukagorili.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/15017478176.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ed64b62aa---daxidujebiduvol.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb3670f30b---60600019233.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2431c8df94---daligubafagev.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/inp9ajh2ana1mklcsolr62ljtp/77690416524.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/94203763543.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/84013485152.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/ea7b44001f8ccff7e3b50eeaa29f37ac/18098618191.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/26071335916.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ea66041f0---bugasij.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/2548465548.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/54153709033.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+reprogram+my+garage+door+remotePDF 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_off0000ccad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAD 16056 bytes
SHA-256: 1e06f80cac0fa00093f76439f5831a2fba094090ac14367e59eca90018004674
font_01_sfnt_off0000f647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF647 10516 bytes
SHA-256: d52ef0da5b5cc6bfb5a8b38af3fb7deb5f7c8b9c754683156300477a5e40b2f4
font_02_sfnt_off00010e11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1