Malicious PDF — malware analysis report

Static analysis result for SHA-256 73568d16053d2ab9…

MALICIOUS

PDF

84.4 KB Created: 2021-09-17 02:03:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6eb7f7e59b15cc01b58aeea4e8ab4d29 SHA-1: 1f0dcd3fcf03a1157e0fc1667c3ef34ec757b83e SHA-256: 73568d16053d2ab9dd35bb81426446363bc99e51743ef2eff0729c93babcd11c
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many of which point to external websites hosted on compromised CMS platforms or disposable hosting. This structure is indicative of a link farm designed to redirect users to malicious sites, likely for phishing or malware delivery. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://fishboat.hr/files/guvewalajodejenidir.pdf In PDF document text
    • https://jurvamartin.com/userfiles/file/puvusolarivuwebibowutu.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/sijimesedazimaxibosubi.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16141c45be4294---pogene.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/93782137332.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021090712545873499.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/nabafonoba.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/78831285911.pdfIn PDF document text
    • https://kermiradiatoriai.lt/images/files/39669942929.pdfIn PDF document text
    • http://espwireless.net/uploads/file/fabenavot.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/91757546024.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/99140965641.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/kuzipetatug.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/21501389211.pdfIn PDF document text
    • http://stapper.de/sites/default/files/userfilesfile/66751380755.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/webujivo.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bef5e67b91---sasefekorenufiwaduv.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/44671026697.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/bewemamufanigebived.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/ff2deb73b2f2f2217cb63c2f9aad7eac/zomabolevomevavap.pdfIn PDF document text
    • http://autodilygood.cz/files/file/xomapebujoz.pdfIn PDF document text
    • https://sibois.eu/userfiles/file/fadilesofoxuri.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/fexibasosotufekusoroviwe.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143bae653fd2---53175727572.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/pigowiwupobut.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/nabipolopiruledupenosef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=watch+anchorman+2+online+free+123moviesPDF 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_off0000e35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB71 18348 bytes
SHA-256: 192cb3a8aa81f90f16b63e8327682afc581c51303445d72dc4a66991a50fb320
font_02_sfnt_off00012a9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9E 11004 bytes
SHA-256: 3412cdabbf48ae20fa04fbce5409d86be8ad5fa1c5ed9159c1504664901fc850

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