Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9afe2177e6b0272…

MALICIOUS

PDF

83.1 KB Created: 2021-09-16 17:36:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f39d96c0e58874a6428dd96ed4da9769 SHA-1: e49035638a470872e87e9e60348f92297db849ee SHA-256: c9afe2177e6b0272d5cd404bc98d296fb3f9fa883be399a892a0f9e5083766a5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=android+silent+mode+from+lock+screen PDF link annotation
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/18535669107.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/161434c31df117---tobamaxozedebotani.pdfIn PDF document text
    • http://radecznica.pl/userfiles/file/20938322593.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/58166139950.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb8d8df4f2---15151932074.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/40293654611.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/sovamobupudigaso.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/sufedirebo.pdfIn PDF document text
    • https://estatecambodia.com/htdocs/cljr/data/files/badigovumiwuk.pdfIn PDF document text
    • http://eternaseguros.net/files/files/zaboluwat.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/dakabalasuwibaj.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210904_173816.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134222c13b0e---xuwuladipupanaguxa.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/15862384415.pdfIn PDF document text
    • http://sweet-sugar.de/images/uploadedimages/file/gijipum.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/6rjolclt4n30b74pe9tj1cslj5/55867777455.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/549e4710d98437fd56f727b4af2c7ca3/xisafa.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/jurubabixog.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/digidutalerip.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/68738464909.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/dujabimizelulus.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/kiwevetawomiza.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/beleviwajeluvowiremu.pdfIn PDF document text
    • http://gaudi.tw/upload/files/44248876037.pdfIn PDF document text
    • http://ubytovna-krumlov.cz/userfiles/file/76758903723.pdfIn PDF document text
    • http://htwy.com/upload/file/24269061730.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161319ced4c75b---52308778928.pdfIn PDF document text
    • https://hotelgaric.com/upload/datoteke/jivujawemikuxawukabopiv.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_off0000dfee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF800 18152 bytes
SHA-256: 95a89b1dd78031eff379e2d0a3006aac9e7fe7b25e2580e7be8420e75abba107
font_02_sfnt_off000126b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B7 10548 bytes
SHA-256: 1b0114d0a4447cb845ee1fef6045fa3df4fcecc9db23da83fa4a91c1f2667786