Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7be20a79b71dbd7…

MALICIOUS

PDF

83.9 KB Created: 2021-10-04 11:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b2bf5b9dbbbdab001a4fa29b05573401 SHA-1: 98aa171f418a066b2cf99a55539d46fd3e22236e SHA-256: f7be20a79b71dbd769b9d060e0b028fb4c316404c260f86d56cd1a50d46d96da
176 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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 http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/cku5mgguu8rfq3jmr17n45btg1/jidodagotatukupunudo.pdf In PDF document text
    • https://jhservice.net/imagenes/galeria/files/solinuridebuxo.pdfIn PDF document text
    • http://banquat.com/userfiles/files/vememabafabaletited.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614eb883320ea---98057298866.pdfIn PDF document text
    • http://midel.me/userfiles/file/dosovawugibawonimame.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/bf944da3b7f6776f898b50fbec6637d7/77771117823.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e5301f312---51634421994.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/7184828698.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/81947462623.pdfPDF link annotation
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/4bcd340e0d3d3b6e586134d8889ebe8a/soraruxuwelapibip.pdfIn PDF document text
    • https://radio-clipa.ro/userfiles/file/bevadogagikupekigug.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/e9aaa3e5f42a5240d2401ea04b1a9d6c/32822029731.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/vimoxunatoziv.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/jokuwuvoz.pdfIn PDF document text
    • http://pferdplus.at/sites/pferdplus.at/files/file/kapuzakipukup.pdfIn PDF document text
    • http://olapromos.com/ola/uploads/editorImagesfiles/pofejujibix.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/tupupopamidizodovenaxe.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/sesitexibarawuw.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/mixaxukopenakederadelumu.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/kumijagirebovedifop.pdfIn PDF document text
    • http://cichanski.com/Upload/file/31070744735.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/razogud.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/98927528296.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202109070906009094.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161534e9f18b04---kutefipusobo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=ayame+from+fruits+basketPDF 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_off0000dfc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DB 19164 bytes
SHA-256: f12e20e4a3f3620a743ef0f63fe0962b76968b0462c630dff7be3dbc2598ef03
font_02_sfnt_off00012966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12966 10652 bytes
SHA-256: e1d6ae4b46b67d117133e3f1245915a1014b944b26e8ba733dd4ec9894fb662b