Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5ade31034e813a9…

MALICIOUS

PDF

81.5 KB Created: 2021-10-29 03:43:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: d37bf122a3749c3d8dc45cb89e5c6cf2 SHA-1: 29ddded9e7e048963eae961a21ea18712d434f0c SHA-256: f5ade31034e813a91bd8aec855fb98b546c0595fc656e0b07bb0dafb35d56a50
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1615d2e031da9c---66419763569.pdf In PDF document text
    • http://surtek.biz/image/files/20150331_151604.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/ae96331d9be8c098a640d925ae2d9c7b/75728242226.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/somuma.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/jowero.pdfIn PDF document text
    • http://vipdiler.ru/files/file/batidizumixizipukofado.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/rutazesi.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/0376205f7e7cca0d4fb3cda7385546b5/10698793584.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/99bd1b509ac14c6c9324dbf46cf0ee93/tewagosedepopit.pdfIn PDF document text
    • https://durimawar.com/contents/files/zomebatexexijoketezesil.pdfIn PDF document text
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/41160006462.pdfIn PDF document text
    • http://master-br.ru/img/file/37178385125.pdfIn PDF document text
    • http://fabrikando.com/cmsimple/images/file/28614073820.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/6b005488312bf98af8db3fdd3dc91b1e/vanumokaf.pdfIn PDF document text
    • https://lompatjauh.com/contents/files/woxumef.pdfIn PDF document text
    • http://playoz.com/ckfinder/userfiles/files/damur.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/nobonarosenudafegopozi.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/wasudofalonitavuvesufap.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/78995591535.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/tuxorifowiwimigojaxex.pdfIn PDF document text
    • http://maihome.hu/admin1/file/bisilejuzo.pdfIn PDF document text
    • http://sirinthepgroup.com/userfiles/file/45767849.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/RhDyTiV0TgQ/uplcv?utm_term=how+to+see+private+account+followers+in+instagramPDF 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_off0000d797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD797 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA9 18000 bytes
SHA-256: c8534bd8291869fddadc3700e21406364dc3e8fccaf3192c68c5f055a78e4607
font_02_sfnt_off00011e72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E72 11068 bytes
SHA-256: 736bb1dd0e706903600e8ff85f9855c3edf10550d0556462bdecc12beb0ce17f