Malicious PDF — malware analysis report

Static analysis result for SHA-256 f178ae8ceb6e6115…

MALICIOUS

PDF

75.2 KB Created: 2021-09-18 23:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bf971a8fdd708653353414a926b7618d SHA-1: 691d45232dd2019d7028874b92940ee82548a18c SHA-256: f178ae8ceb6e61159533d97d823b2d721db3a00f975b6b2c09f75ef9fbfba1c0
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure itself appears to be a lure, likely intended to be delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://tetrafluoro.com/upload/files/nugetuwarel.pdf In PDF document text
    • http://sarkanyhajo.hu/files/file/35557528756.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/sujugipamapub.pdfIn PDF document text
    • http://pyramidplaster.com/file_media/file_image/file/96185881625.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/kejevijobedewezekilelunu.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/gikaxigobeze.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/18840908599.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/pukok.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/tajudi.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/d89553c462b115a84bd0b5733c3bae83/mutuvevotumiragegovobewaw.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/84109432252.pdfIn PDF document text
    • https://organicearthfiji.com/documents/file/27326378643.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/82440528064.pdfIn PDF document text
    • https://metnar.pl/web/uploads/files/dowasamolojunibikexunuk.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/23bc7b577c58b4ff6aa55b5aa2981754/xosibetiregisomosi.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/tuzosaguxupuva.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131f886d9f4a---13323057438.pdfIn PDF document text
    • https://corpus.bg/files/fck/file/wetazabewatewizitufotamef.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161400c817502c---74232195648.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/72984559043.pdfIn PDF document text
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/sofibiteduxaj.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/vidiwazababapir.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/gabudepugupusude.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/ruborigemebegedafowozij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=hp+lovecraft+stories+pdfPDF 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_off0000c552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC552 16364 bytes
SHA-256: 3e8bc02449dff8497616dd09f5746b8f52535716c3c4cc997ea1992435566e46
font_01_sfnt_off0000ef2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10743 10568 bytes
SHA-256: 3955342b3097ef458904b87471511c240edd61423219693c6881cbdd732907e6

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