Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea35c900d223365e…

MALICIOUS

PDF

84.8 KB Created: 2021-09-14 03:20:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a3fa7c4ed4415bcbc11fa0ed0c7a8980 SHA-1: 31fa7836c419ea2fc7507579031cc542406f4a6c SHA-256: ea35c900d223365ece91e96481510bc45c71bf12faa1bf27ce59485cdffa0fa4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, directing users to various disposable hosting sites, likely to facilitate the download of further malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the true malicious destination through a network of compromised or low-reputation domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://inprovit.com/ckfinder/userfiles/files/rumenabitoparapek.pdf In PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec610a822f---bezaruzudutalenukil.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/nujipidipipu.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/wobereseroxixolume.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/qhbfv3r5ap9qbrpgc63tqs1ge2/65447737472.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/doretoralilifepidanusuvot.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/depaxor.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/lanizozewuvowokeverinapor.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/19685110166.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/setupifutevexazuterimivul.pdfIn PDF document text
    • https://firmabudowlanawalczak.pl/web/uploads/files/wofevusajudemavobo.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/dizojilonozuvebiw.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109040054112930.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613870efc8c25---22245011176.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/nekunokalujon.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/piganizenelif.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/40884535976.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/35152862126.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/35680630887.pdfIn PDF document text
    • http://prosquash.by/data/sevoxanibalufegalopo.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/bexaweweninesuleriwijizo.pdfIn PDF document text
    • http://talesma.com/E/file/72971783458.pdfIn PDF document text
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/17540527686.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=download+game+hungry+shark+evolutionPDF 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_off0000ded0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED0 11152 bytes
SHA-256: 6062baf561426cdc010e9e8029f8c1f1c61dd76bc2332b233179117c3563b156
font_01_sfnt_off0000f88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88A 20052 bytes
SHA-256: a4124283faf241f368420052bbfbc09d8742354fb394b5e789aaadc7cabb8b8b
font_02_sfnt_off00012da0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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