Malicious PDF — malware analysis report

Static analysis result for SHA-256 057717aa87bf1679…

MALICIOUS

PDF

71.1 KB Created: 2021-10-03 04:21:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 78f9d146030d759280ff25155cb9afef SHA-1: 298520a0990f85efdea7c9a5897438a2ce9ad173 SHA-256: 057717aa87bf1679c3174ad834b24c112025d3ddb55d6e46fcee2311a1eccb6e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many external URIs pointing to compromised WordPress uploads and disposable hosting. The embedded URLs suggest the document's purpose is to redirect users to potentially harmful sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=the+adventure+of+the+speckled+band+test+answers PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ba3f305417---15712440256.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/67232260220.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158fee25e62d---75181257475.pdfIn PDF document text
    • http://sh-ether.com/uploadfiles/files/kapisafazupitepu.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/rozetarovirenigawun.pdfIn PDF document text
    • http://consade.com/userfiles/file/91391143023.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/7803976753.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/duwabudarivegab.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/fukojamaxi.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/97667453907.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613afade26e93---41511940827.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/15317713935.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/74851087969.pdfIn PDF document text
    • http://hasicimosnov.cz/foto/Image/file/65258481029.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/94309161862.pdfIn PDF document text
    • http://podarox.ru/public/files/16289099355.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/87699133845.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/nasosidigawuvapuzexujeg.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/10616703650.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/tomesasimolasoradukiwe.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe4d8834a4---vadivatugimobuxeno.pdfIn PDF document text
    • https://vietfun.com.vn/wp-content/plugins/super-forms/uploads/php/files/70q6gi2k1kmre3j3d8v7q9ci3d/46039719669.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/wuzikudajitujogabisu.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161582141796c0---3727217578.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_off0000b42f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB42F 16012 bytes
SHA-256: 39e6102ced6f2aaae191e40c9ebc33c692cfdab2f0875070d9208e5db3d37999
font_01_sfnt_off0000dc49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF460 11072 bytes
SHA-256: 63cb245e4ce2baebc408d993419d04bba57bbe9e21189c09fa3224d4fae36f14

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