Malicious PDF — malware analysis report

Static analysis result for SHA-256 c707e57f7b495ef0…

MALICIOUS

PDF

84.2 KB Created: 2021-09-11 19:11:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: edf3e07fe657a4e7ee8b028525c528bd SHA-1: 3a3b85bfee7bf3b9fd83107367d4ea47ed62d7da SHA-256: c707e57f7b495ef0be0f2ab102ba4d345aeb38737856c1f4690a504a5cc6e316
164 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier with high confidence. It contains numerous external links, many pointing to other PDF files hosted on compromised or disposable domains, suggesting a link farm or redirection mechanism. The presence of a 'download button' heuristic further supports a lure-based attack pattern. While no scripts were explicitly extracted, the nature of the PDF and its links strongly suggests it's part of a chain designed to deliver further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=siren+head+scp+6789+extreme+horror+survival PDF link annotation
    • https://marblobath.com/app/webroot/img/files/66031656299.pdfIn PDF document text
    • https://mediaskills.rs/files/1273865664.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613182d9e52a3---xojutirelazizumam.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/mujuluniselotuxonufit.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/juzidufesodigelunu.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210904055016.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/d55te1fgokrid3llgi1rhiosb5/12729718078.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/supule.pdfIn PDF document text
    • http://tnetimes.kr/upload/file///89718508184.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/batalasamuj.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133fc8452686---13127380487.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/31019596991.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/kapemobodejalomuduji.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/71273500822.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210903231203.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/fofoni.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/duzanitaxekunoseli.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/biwojesedadez.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/65599191659.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/9920702142.pdfIn PDF document text
    • http://grabnerestriche.at/75010399362.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_off0000daf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF307 11716 bytes
SHA-256: de10820756d9c5218a84506d8b7a5c2af0774321b042862ccf7210dbc7774ef3
font_02_sfnt_off00010ebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBF 20452 bytes
SHA-256: 1718a71aec5e670a74b8fc9d2ff7429ad6cd135a223764849d0bdb422123f32f

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