Malicious PDF — malware analysis report

Static analysis result for SHA-256 55d4b82dc6a180f1…

MALICIOUS

PDF

85.1 KB Created: 2021-09-21 02:38:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 87617f929b46eda29b836e750307169d SHA-1: 4f4c7c882940637d174203c7e020ef873e885798 SHA-256: 55d4b82dc6a180f1bbd1bf63e6ba1a6cb9b3ec99a78b3ef5714fe08a6a48b74e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=best+game+like+cod PDF link annotation
    • http://osteriailgalloelinnamorata.com/userfiles/files/11541121213.pdfIn PDF document text
    • http://lactopad.com/uploads/files/11497226993.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/74910162661.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/jevuletekumutozopapuj.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161442432ad7a5---valojine.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138970856688---23064066497.pdfIn PDF document text
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/90884500310.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/turisa.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210916205434.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/2432579160.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/58567243210.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/vodukofabetulosu.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/13476012272.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/memagalifiguxozolesemi.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f97b60b098---mamagifekujobere.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/magofizetit.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/42900951946.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210921045907354.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/79854060443.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/15920639971.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/74530653448.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_off0000e74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74E 18148 bytes
SHA-256: 548c34498e7703ec235c07382e8312f808d646bd224ff704936af98dde63c3af
font_01_sfnt_off0001168b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168B 10652 bytes
SHA-256: 5199dfa2635939f42670b26ec837238fb58410a062feb9fc48f883e67e152500
font_02_sfnt_off00012ecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ECF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1