Malicious PDF — malware analysis report

Static analysis result for SHA-256 61d1c8b2a36e5d22…

MALICIOUS

PDF

87.5 KB Created: 2021-09-20 15:17:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: e0f9f04f85d9eed0404a62d260740a8d SHA-1: ab042a4051d788aa7bf84395f0ce8d8276c80216 SHA-256: 61d1c8b2a36e5d221c2c5df295d2015cab6c2c3466fa4eb1076603aafc5b1ff2
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to domains identified as disposable or compromised. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document's structure as a link farm suggests an attempt to lure users to external sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://119pump.net/d/files/minajuzibixivijunuzevu.pdf In PDF document text
    • https://performanshost.com/calisma2/files/uploads/nijejopatalekajuver.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/dujabimizelulus.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/77543166904.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/jivapala.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/vavifokigubekidojem.pdfIn PDF document text
    • http://ssanadia.in/userfiles/file/dajosajurawobejazubiner.pdfIn PDF document text
    • http://neuroxl.com/images/file/92751520431.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/161446cb7e6388---26173222010.pdfIn PDF document text
    • https://oriontradecom.com/ckfinder/userfiles/files/lumuvijuzatigaxijifa.pdfIn PDF document text
    • https://ribaczpeter.hu/files/file/wuliwobake.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/25054796251.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/sekubuj.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/46598147648.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/basabeg.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/16743674072.pdfIn PDF document text
    • http://elitacasa.it/images/file/fikotizizava.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/5589083753.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/20455441312.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130822709740---fotewanirudem.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613beaf282244---dawivesexuvuga.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/bosumatizalu.pdfIn PDF document text
    • http://mannadey.in/FCKeditor/file/tonumitezoba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=marvin+the+hitchhiker%27s+guide+to+the+galaxyPDF 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_off0000ef91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF91 17688 bytes
SHA-256: 9fb0f58a05fe440c8327c75bd8d837bd73f86c4648a2490dc1fb1cf324bd222f
font_01_sfnt_off00011dcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E2 11152 bytes
SHA-256: 159a013df613eb5e051a94bbbccf535ced1c401dbda4328726078d73198f9922